>
Live now

API-first, down to the SIM.

Everything the dashboard does is an API call: buy data, provision eSIMs, rent numbers, send SMS, configure Tele Agent. Built for human developers — and for autonomous AI agents.

Live today

The developer platform is already open.

No sales call, no human-gated first project: sign in and mint your own API keys. The product endpoints (catalog, checkout, numbers, Tele Agent) are live — everything below works right now.

Self-serve API keys

Sign in with Firebase and mint esk_live_… keys instantly — scoped to a project (production, test, experiment), hash-stored, revocable in one call.

# mint a key
curl -X POST \
  https://api.esimgomobile.com/api/v1/keys \
  -H "Authorization: Bearer $FIREBASE_ID_TOKEN" \
  -H "Content-Type: application/json" \
  -d '{"name":"ci","project":"test"}'

Webhooks: com.esimgomobile.*

HTTPS endpoints, per-endpoint HMAC-SHA256 signatures (Stripe-style t=…,v1=…), at-least-once delivery with backoff, dead-lettering and replay. Billing, number provisioning, porting, calls, SMS, key and KYC events.

Number porting API

draft → information_required → pending → completed. The API tells you exactly which fields each country needs before you submit — submission is fail-closed until carrier onboarding completes.

KYC intake

Collect the identity documents carriers require per country. Verification stays honestly pending_verification until a verification vendor is configured — never a fake "verified".

Honest status page

Component states derived live from service configuration — never fabricated uptime percentages.

esimgomobile.com/status/ →

REST API

The v1 API contract — live now.

The product contract below is final for v1 and live on the platform. Authenticate with a bearer API key; every response is JSON.

MethodEndpointWhat it does
GET/api/catalogList live eSIM plans (country, data, validity, price)
POST/api/checkoutCreate a checkout session for a plan → returns payment URL
GET/api/accountOrders, lines, numbers and Tele Agent status
GET/api/qr?order_id=…Fetch or re-issue the eSIM QR / activation code
GET/api/balance?profile_id=…Live remaining data for an eSIM line
GET/api/numbers?country=…Search available virtual numbers
POST/api/numbers/purchaseRent a virtual number (monthly)
POST/api/teleagent/signupAttach Tele Agent to a number with business config
# list live eSIM plans
curl https://esimgomobile.com/api/catalog \
  -H "Authorization: Bearer $ESIM_API_KEY"

# → { "plans": [ { "id": "esim-jp-10gb-30d", "country": "Japan",
#     "data_gb": 10, "validity_days": 30, "price_usd": 24.9, ... } ] }

# check data balance on a line
curl "https://esimgomobile.com/api/balance?profile_id=prof_abc" \
  -H "Authorization: Bearer $ESIM_API_KEY"

# → { "profile_id": "prof_abc", "remaining_mb": 6240,
#     "total_mb": 10240, "percent": 61 }
Developer surface

Four ways to build.

SDKs

Live: idiomatic JavaScript and Python clients covering every live route — keys, webhooks, porting, KYC, status. Tested, versioned, on GitHub.

Status: live

CLI

Live: the esim CLI scripts everything from the terminal — esim keys issue, esim webhooks register, esim portings create, esim kyc verify. Made for automation and agents.

Status: live

MCP server

A Model Context Protocol server exposing the whole platform to AI agents — buy data, provision lines, manage numbers and Tele Agent from any MCP client. Already powering our ChatGPT app; the same server ships for Claude and other agents.

Status: in progress

Migrate from Twilio in three steps

Bring your Twilio voice/SMS app to esimgomobile without rewriting it: port your numbers, point your webhooks at our compatible endpoints, verify with a test call. A guided toolkit walks the whole move — numbers, messaging and Tele Agent included.

Status: live
Get building

Developer keys are live today.

Sign in, mint an esk_live_… key and start building against the live developer platform — webhooks, porting, KYC and status included.

Read the OpenAPI doc

esimgomobile in Czechia

Using developers in Czechia? You are on the local edition — key facts for Czechia (capital Prague, dial code +420) are below. esimgomobile plans for Czechia are live now — monthly plans from $8/mo and one-time travel packs from $3.65, with live checkout.

CapitalPrague
Dial code+420
CurrencyCzech koruna (CZK)
Time zoneUTC+1
Main languagesCzech

Plans are live — see plans and pricing.

The experience

Twenty screens, twenty photos.

Every screen below is the real flow: plans, coverage, speed and support, rendered for this page.

My eSIM
54%20 GB left
Days left26
Top up+10 GB
Data dashboard on Developers · Czechia: 54% remaining, days left, top-up one tap away.
  1. 1The Tele Agent answers in plain language — no telecom jargon.
  2. 2Every answer is specific to your trip, not a generic FAQ.
esimgomobile.com
Plans for Czechia
Atlas 5GB5 GB · 30 days
Atlas 20GB20 GB · 30 days
Atlas 50GB50 GB · 60 days
Compare plans
Plan picker on Developers · Czechia: 5GB, 20GB, 50GB and Unlimited — pick by trip, not fine print.
  1. 1The dashboard keeps every eSIM, every trip, in one place.
  2. 2Rows show data left, days left and current city at a glance.
esimgomobile.com
Dashboard
Active eSIMs1
Data left10 GB
Current cityCzechia
Web dashboard on Developers · Czechia: every eSIM, every trip, 10 GB left — one screen.
  1. 1The dashboard keeps every eSIM, every trip, in one place.
  2. 2Rows show data left, days left and current city at a glance.
Launch facts
195destinations live
31free tools
$8entry monthly plan
Launch facts behind Developers · Czechia — 195 destinations live, 31 free tools, $8 entry monthly plan: numbers we publish and stand behind.
  1. 1Mockups illustrate the product flow — captions describe what's real.
  2. 2Figures labeled as examples show sample data, never live telemetry.
esimgomobile.com
Checkout
Atlas 20GB — Czechiatotal
Taxescalculated
Pay securely
256-bit encrypted · Amazon Pay
Secure checkout on Developers · Czechia: Atlas 20GB, full price up front, no fine print.
  1. 1Checkout shows the full price before you pay. Nothing hidden.
  2. 2Amazon Pay handles payment securely; taxes are calculated for you.
vs roaming
esimgomobile eSIMone price
Carrier roamingper-day fees
10 GB · 14 days · Czechia
The honest comparison on Developers · Czechia: one prepaid eSIM price versus carrier roaming.
  1. 1The roaming math, made visible: one price versus per-day carrier fees.
  2. 2This is the comparison most travelers never see until the bill.
Language
EnglishDeutsch日本語
Language picker on Developers · Czechia — English, Deutsch, 日本語: the app speaks six languages.
  1. 1Usage ring compresses the whole plan into one glanceable number.
  2. 2Percent remaining is the only metric most travelers check.
group of people using laptop computer
Czechia
eSIM dataLive
Local numberAvailable
5GYes
Coverage card on Developers · Czechia: data live, local number available, 5G where it exists.
  1. 1The roaming math, made visible: one price versus per-day carrier fees.
  2. 2This is the comparison most travelers never see until the bill.
two women walking on beach
Pack light. Stay connected in Czechia.
Get your eSIM
Live now · no waitlist
“Pack light. Stay connected in Czechia.” — the CTA card on Developers · Czechia: plans live now, no waitlist.
  1. 1The roaming math, made visible: one price versus per-day carrier fees.
  2. 2This is the comparison most travelers never see until the bill.
esimgomobile.com
API quickstart
curl https://api.esimgomobile.com/v1/esims \
  -H "Authorization: Bearer $KEY" \
  -d '{"country":"CZ"}'
200 OK · 81 ms
REST API behind Developers · Czechia: issue eSIMs programmatically — 200 OK in milliseconds.
  1. 1The dashboard keeps every eSIM, every trip, in one place.
  2. 2Rows show data left, days left and current city at a glance.
Czechia · coverage
5 carriers · automatic selection
Coverage map on Developers · Czechia: partner networks pinned, selection automatic.
  1. 1A real support transcript: the question, then the specific answer.
  2. 2This is what 'AI support' actually looks like in practice.
Support
How does Developers · Czechia work?
Enter your trip details and get an instant answer — no account needed.
Support snippet — Developers · Czechia: what it does, in one honest answer.
  1. 1Coverage status at a glance: data live, number available, 5G ready.
  2. 2Green means go — no guessing about what's supported.
46%
data left
Usage ring on Developers · Czechia — 46% of data left: the number travelers check most.
  1. 1Usage ring compresses the whole plan into one glanceable number.
  2. 2Percent remaining is the only metric most travelers check.
Speed test
727Mbps
5G · Czechia · 67 ms
Illustrative speed readout on Developers · Czechia: 727 Mbps, 67 ms — example figures, not live measurements.
  1. 1Illustrative speed readout: sample carrier, city and latency figures.
  2. 2The meter demonstrates the readout — figures are examples, not live measurements.
Install
1 Scan2 Add3 Go
The Developers · Czechia install: QR in three steps — scan, add, go, about two minutes.
  1. 1The Tele Agent answers in plain language — no telecom jargon.
  2. 2Every answer is specific to your trip, not a generic FAQ.
Recent speeds
Seoul473 Mbps
Paris830 Mbps
Barcelona858 Mbps
Recent speeds for Developers · Czechia — Seoul, Paris, Barcelona: illustrative 5G figures, not live measurements.
  1. 1Coverage pins show where partner networks are live.
  2. 2The map answers the only question that matters: will it work there?
vibrant nightlife alleyway in japanese cityscape
Czechia is calling.
Get your eSIM
“Czechia is calling.” — the banner on Developers · Czechia: two minutes from curious to connected.
  1. 1A real support transcript: the question, then the specific answer.
  2. 2This is what 'AI support' actually looks like in practice.
esimgomobile.com
white concrete buildings near the sea
esimgomobile Developers
Travel guides · 8 min read
From the blog: “esimgomobile Developers” — travel guides in about eight minutes.
  1. 1Checkout shows the full price before you pay. Nothing hidden.
  2. 2Amazon Pay handles payment securely; taxes are calculated for you.
Tele Agent transcript
Will my phone work in Czechia?
If it's carrier-unlocked and eSIM-capable, yes. I checked Czechia bands — you're covered.
Tele Agent transcript on Developers · Czechia: real question, specific answer.
  1. 1A real support transcript: the question, then the specific answer.
  2. 2This is what 'AI support' actually looks like in practice.
Atlas 5GB
5 GB · 30 days
Czechia
Atlas 5GB — 5 GB · 30 days, prepaid and ready on Developers · Czechia.
  1. 1The plan chip: name, allowance and destination in one line.
  2. 2Everything you need to confirm you're on the right plan.
selective focus photo of airplane window — Developers · Czechia: The last night: photo album backed up, memories safe before wheels-up.
Developers · Czechia: The last night: photo album backed up, memories safe before wheels-up.
Black and white photo of a man using a smartphone while traveling on a modern train. — Developers · Czechia: City lights after dark — the eSIM doesn't care what time it is.
Developers · Czechia: City lights after dark — the eSIM doesn't care what time it is.
aerial view of manhattan skyline and hudson river — Developers · Czechia: The welcome home: eSIM deleted in one tap, no contract to cancel.
Developers · Czechia: The welcome home: eSIM deleted in one tap, no contract to cancel.
a man and a person sitting on the beach — Developers · Czechia: Duty-free browsing: price-checked against home before buying.
Developers · Czechia: Duty-free browsing: price-checked against home before buying.
eiffel tower and building — Developers · Czechia: The window seat office: emails sent somewhere over the ocean.
Developers · Czechia: The window seat office: emails sent somewhere over the ocean.
futuristic skyscrapers in midtown manhattan in new york city — Developers · Czechia: The departure board flips: gate found, lounge located, all on the eSIM.
Developers · Czechia: The departure board flips: gate found, lounge located, all on the eSIM.
Tom Fisk — Developers · Czechia: Market mornings: look up the dish, translate the menu, pay by phone.
Developers · Czechia: Market mornings: look up the dish, translate the menu, pay by phone.
photo of a woman on the screen of a laptop — Developers · Czechia: The sunrise ferry: tickets in the wallet app, timetable cached offline.
Developers · Czechia: The sunrise ferry: tickets in the wallet app, timetable cached offline.
a view of new york — Developers · Czechia: Hiking the ridge: trail map offline, emergency numbers saved.
Developers · Czechia: Hiking the ridge: trail map offline, emergency numbers saved.
Dr.Ramsinh Jadav — Developers · Czechia: Souvenir hunting with live currency conversion in your pocket.
Developers · Czechia: Souvenir hunting with live currency conversion in your pocket.
Victor Lucas — Developers · Czechia: Café office: hotspot running, video call stable, no hotel Wi-Fi roulette.
Developers · Czechia: Café office: hotspot running, video call stable, no hotel Wi-Fi roulette.
new york city — Developers · Czechia: The red-eye recovery: hotel early-check-in arranged mid-flight.
Developers · Czechia: The red-eye recovery: hotel early-check-in arranged mid-flight.
smoothie on top of white laptop computer — Developers · Czechia: The conference badge: QR ticket scanned, session schedule synced.
Developers · Czechia: The conference badge: QR ticket scanned, session schedule synced.
green cactus plant near white concrete wall — Developers · Czechia: Sunrise hikes start with a weather check — data on, boots on.
Developers · Czechia: Sunrise hikes start with a weather check — data on, boots on.
Alexey K. — Developers · Czechia: Coast roads and country lanes — the map keeps up wherever you roam.
Developers · Czechia: Coast roads and country lanes — the map keeps up wherever you roam.
man working on computer at outdoor cafe — Developers · Czechia: The viewpoint at golden hour: livestream the sunset to everyone back home.
Developers · Czechia: The viewpoint at golden hour: livestream the sunset to everyone back home.
woman in pink blouse texting on a smartphone — Developers · Czechia: SDKs, a CLI, and an MCP server — the developer surface, complete.
Developers · Czechia: SDKs, a CLI, and an MCP server — the developer surface, complete.
teenagers walking out of sea — Developers · Czechia: The business trip: client deck synced, video call joined from the taxi.
Developers · Czechia: The business trip: client deck synced, video call joined from the taxi.
anonymous ethnic worker writing near laptop on cafe terrace — Developers · Czechia: Currency exchange, skipped: the phone pays at the real rate.
Developers · Czechia: Currency exchange, skipped: the phone pays at the real rate.
scenic view of santorini s iconic blue domes — Developers · Czechia: Migrate from Twilio in three steps — the toolkit does the heavy lifting.
Developers · Czechia: Migrate from Twilio in three steps — the toolkit does the heavy lifting.

Explainer

esimgomobile Developers: the full picture

Everything on this page exists to answer one question well: how does esimgomobile fit into your trip? The sections below go deep so you never need a second tab.

The long version is the rest of this page — plans, mechanics, edge cases and honest trade-offs, written the way we'd explain it to a friend.

The short version: prepaid travel eSIMs across 195 destinations, installed by QR code in two minutes, managed from a dashboard, with an AI agent on call when you need a human-style answer fast.

Explainer

How it works, step by step

  1. Choose data that fits the trip
    • Short city break? 5 GB. Two weeks with maps and video calls? 20 GB. Working remotely or hotspotting? 50 GB or Unlimited.
    • Every plan shows exactly what you get — no asterisks.
  2. Install in two minutes
    • Buy, scan the QR code, done. The whole thing happens on your phone, wherever you are.
    • Install days before you fly or minutes before boarding — your call.
  3. Switch on and go
    • Enable the eSIM line in settings when you arrive. It connects to the fastest local partner network on its own.
    • Your home number keeps working for calls and texts on your physical SIM if you keep it active.

Explainer

Good to know

  • Turn off auto-play on social apps before you fly; it quietly eats roaming data.
  • Keep your home SIM active for two-factor codes from your bank; run data on the eSIM line.
  • Screenshot your hotel address and booking confirmations — you'll want them with no signal.
  • Save your eSIM QR code somewhere safe (email it to yourself) in case you switch phones mid-trip.
  • Hotspot sparingly: one laptop tethered all day can burn through a week of phone data.
  • Download offline maps for your destination — they save data and work in dead zones.

These are the details that separate a smooth trip from a stressful one — small, unglamorous, and worth more than any feature list.

Explainer

Why travelers switch

And because everything is prepaid through Amazon Pay, the commercial relationship is simple: you pay for data, you get data, it ends when it ends.

Roaming bills taught a generation to fear their phones abroad. The eSIM generation simply never learned that fear — data is prepaid, visible and finite.

The Tele Agent closes the remaining gap: a question at midnight in a foreign terminal gets an answer in seconds, not a support ticket.

By the numbers

The numbers behind Czechia.

esimgomobile Developers — data dashboard

The product's headline numbers, switchable by dataset.

195
destinations live
global footprint
4
Atlas plans
prepaid, no contracts
~2 min
typical install
QR scan to online
6
app languages
EN ES FR DE PT JA
Atlas 5GB: 5 GB over 30 days — Weekend breaks & light useAtlas 5GB 5 GBAtlas 20GB: 20 GB over 30 days — Two-week trips & daily useAtlas 20GB 20 GBAtlas 50GB: 50 GB over 60 days — Remote work & hotspottingAtlas 50GB 50 GBAtlas Unlimited: Unlimited over 30 days — Heavy use, zero meteringAtlas Unlimited Unlimited
Atlas 5GB: 30-day validityAtlas 5GB 30 daysAtlas 20GB: 30-day validityAtlas 20GB 30 daysAtlas 50GB: 60-day validityAtlas 50GB 60 daysAtlas Unlimited: 30-day validityAtlas Unlimited 30 days
Illustrative — D1: 100% of maxIllustrative — D10: 70% of maxIllustrative — D20: 42% of maxIllustrative — D30: 12% of maxDay 1Day 10Day 20Day 30IllustrativeIllustrative 20 GB burn-down at moderate use.

Hover any bar or point for its exact value. Tabs switch datasets — everything on this panel is computed from live product data unless labeled illustrative.

esimgomobile Developers — data dashboard. Plan allowances, validity windows and a typical usage curve for esimgomobile Developers — hover for exact values.
How esimgomobile Developers worksFour steps from question to answerHow this tool worksBuilt to answer one question well.1Enter your detailsTrip, data needs, destination. The tool does the math.2Get the answerClear result with next steps — save it or act on it.3Apply itJump straight to the plan, setting or page it points to.4Open the toolNo account needed — it loads instantly in your browser.
Tool walkthrough. Every tool on esimgomobile follows the same honest pattern: input, math, answer.
Plan comparison matrixEvery plan for Czechia — data, validity, best fitPlans at a glanceFour prepaid plans cover every kind of trip to Czechia.PLANDATAVALIDITYAtlas 5GBWeekend breaks & light use5 GB30 daysAtlas 20GBTwo-week trips & daily use20 GB30 daysAtlas 50GBRemote work & hotspotting50 GB60 daysAtlas UnlimitedHeavy use, zero meteringUnlimited30 days
Plan comparison matrix. All four Atlas plans work in Czechia; pick by trip length and appetite for data.
Get connected in three stepsFrom purchase to online in about two minutesGet connected in three stepsNo store visit, no plastic SIM, no waiting for the post.1Land connectedSwitch the line on when you arrive — online before baggage claim.2Scan the QR codeThe eSIM installs straight onto your phone. No store, no plastic SIM.3Pick your planChoose data for your trip — checkout takes about two minutes.
Three-step setup. Three steps, about two minutes — the Developers · Czechia ritual, no store visit.
Network at a glanceCoverage facts for CzechiaNetwork at a glanceThe numbers that matter before you buy.195destinations liveesimgomobile network data5Gwhere available in Czechiaesimgomobile network data6app languagesesimgomobile network data2 mintypical install timeesimgomobile network dataPlus: local numbers where available, hotspot included, 24/7 support.Prepaid only — when the plan ends, it simply stops. No contracts.
Coverage facts. Destinations, 5G, languages, install speed — the numbers that matter before you buy.
Who it's forFour travelers, one toolWho it's forBuilt for real trip shapes, not personas.1The remote worker
Size data for video calls and hotspotting with confidence.
esimgomobile network data2The last-minute flyer
Answer in minutes, eSIM installed before boarding.
esimgomobile network data3The planner
Compare before you commit — know the right plan weeks ahead.
esimgomobile network data4The family organizer
One tool, every traveler's needs covered.
esimgomobile network data
Use cases. If you recognize yourself here, the tool will pay for its click.
Questions, answeredThe six things everyone asks firstQuestions, answeredShort answers, no sales pitch.Do I keep my number?
Yes — WhatsApp & iMessage keep working on your existing number.
What if data runs out?
80% alert, then one-tap top-up. No bill shock.
Does hotspot work?
Yes — share your connection with laptop or tablet.
Which phones work?
Any carrier-unlocked, eSIM-capable iPhone or Android.
Is it a contract?
No — prepaid. Service simply stops instead of charging extra.
How fast is setup?
About two minutes: plan, QR scan, done.
FAQ at a glance. Still curious? The Tele Agent answers anything else instantly.
What your gigabytes meanTypical hourly usage per activityWhat your gigabytes meanTranslate plan sizes into real travel behavior.Maps & navigation≈ 5 MB / hourMessaging & email≈ 20 MB / hourSocial browsing≈ 150 MB / hourVideo calls≈ 600 MB / hourHD streaming≈ 1.5 GB / hourTypical usage rates — actual consumption varies by app and quality settings.
Data usage guide. Maps sip, streaming gulps: size the plan to your heaviest habit.
Pro tipsFour habits of the always-connectedPro tipsSmall habits, big difference.1Download offline mapsThey save data and work in dead zones.2Screenshot bookingsHotel address & confirmations, available with no signal.3Check unlock statusCarrier-locked phones can't add an eSIM — verify first.4Install before you flyAirport Wi-Fi is the worst place to set up connectivity.
Pro tips. Veterans do all four without thinking.
esimgomobile Developers: capability profileWhat the tool is good at — illustrative profileCapability profileFive strengths, ranked by what users feel first.Mobile friendlyworks on the phone in your handAlways currentreflects live plans and coveragePrivate by designyour inputs stay in your browserShares wellsend the answer to travel companionsInstant resultsno waiting, no signupIllustrative profile based on tool design — not measured telemetry.
Capability profile. Capabilities measured by traveler value, not feature count.
Every plan includesNo tiers of basic dignity — these ship with all plansEvery plan includesThe baseline is generous on purpose.6 languagesThe app speaks your language, wherever you're from.24/7 supportReal humans plus the Tele Agent, around the clock.Keep your WhatsAppYour existing number keeps working on the data line.Hotspot includedShare with your laptop or tablet at no extra cost.5G where availableFastest local partner network, selected automatically.One-tap top-upMore data in seconds — no new QR code.
Included with every plan. From 5 GB to Unlimited, the inclusions don't shrink.

Take Czechia with you, connected

Join thousands of travelers who land connected. Your eSIM installs in two minutes.

See plans and pricing Talk to the Tele Agent