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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 China

Using developers in China? You are on the local edition — key facts for China (capital Beijing, dial code +86) are below. esimgomobile plans for China are live now — monthly plans from $8/mo and one-time travel packs from $3.65, with live checkout.

CapitalBeijing
Dial code+86
CurrencyChinese yuan (CNY)
Time zoneUTC+8
Main languagesMandarin

Plans are live — see plans and pricing.

Up close

esimgomobile in action.

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

Language
FrançaisPortuguêsEnglish
Language picker on Developers · China — Français, Português, English: 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.
esimgomobile.com
Checkout
Atlas Unlimited — Chinatotal
Taxescalculated
Pay securely
256-bit encrypted · Amazon Pay
Secure checkout on Developers · China: Atlas Unlimited, full price up front, no fine print.
  1. 1Three plans side by side so the trade-off is obvious.
  2. 2Pick by trip length, not by decoding fine print.
esimgomobile.com
Dashboard
Active eSIMs3
Data left50 GB
Current cityChina
Web dashboard on Developers · China: every eSIM, every trip, 50 GB left — one screen.
  1. 1Three plans side by side so the trade-off is obvious.
  2. 2Pick by trip length, not by decoding fine print.
China · coverage
5 carriers · automatic selection
Coverage map on Developers · China: 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.
silhouette of people by the seashore
China is calling.
Get your eSIM
“China is calling.” — the banner on Developers · China: 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.
church tower against a clear sky
Get connected
1 Pick a plan2 Scan QR3 Land online
Three steps on Developers · China: pick a plan, scan the QR, land online.
  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.
candid moment at mumbai airport viewing area
“Customs line in China was the perfect time to install — done by baggage claim.”
Maya R.Verified traveler · China
Traveler review for Developers · China: “Customs line in China was the perfect time to install — done by baggage claim.” — Maya R..
  1. 1A real traveler quote, tied to the destination it mentions.
  2. 2Reviews reference actual trips, not generic praise.
vs roaming
esimgomobile eSIMone price
Carrier roamingper-day fees
10 GB · 14 days · China
The honest comparison on Developers · China: one prepaid eSIM price versus carrier roaming.
  1. 1A real traveler quote, tied to the destination it mentions.
  2. 2Reviews reference actual trips, not generic praise.
Network
5G
China connected
Network widget for Developers · China: 5G, full bars — zero ambiguity about the connection.
  1. 1The Tele Agent answers in plain language — no telecom jargon.
  2. 2Every answer is specific to your trip, not a generic FAQ.
94%
data left
Usage ring on Developers · China — 94% 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.
esimgomobile.com
Sharad Bhat
esimgomobile Developers
Travel guides · 8 min read
From the blog: “esimgomobile Developers” — travel guides in about eight minutes.
  1. 1Three plans side by side so the trade-off is obvious.
  2. 2Pick by trip length, not by decoding fine print.
esimgomobile.com
API quickstart
curl https://api.esimgomobile.com/v1/esims \
  -H "Authorization: Bearer $KEY" \
  -d '{"country":"CH"}'
200 OK · 119 ms
REST API behind Developers · China: issue eSIMs programmatically — 200 OK in milliseconds.
  1. 1Checkout shows the full price before you pay. Nothing hidden.
  2. 2Amazon Pay handles payment securely; taxes are calculated for you.
Recent speeds
Mexico City460 Mbps
Singapore152 Mbps
Barcelona123 Mbps
Recent speeds for Developers · China — Mexico City, Singapore, Barcelona: illustrative 5G figures, not live measurements.
  1. 1Mockups illustrate the product flow — captions describe what's real.
  2. 2Figures labeled as examples show sample data, never live telemetry.
Coverage
195
destinations live
China5G ready
Check coverage
Coverage at a glance for Developers · China: 195 destinations live, fastest local partner selected on its own.
  1. 1The plan card shows exactly what you're buying — data, days, destination.
  2. 2One tap starts the two-minute QR install.
$8
entry monthly plan
launch fact
Launch fact behind Developers · China: $8 entry monthly plan — a fixed figure, not live telemetry.
  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
Plans for China
Atlas 5GB5 GB · 30 days
Atlas 20GB20 GB · 30 days
Atlas 50GB50 GB · 60 days
Compare plans
Plan picker on Developers · China: 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.
people working in a call center
China
eSIM dataLive
Local numberAvailable
5GYes
Coverage card on Developers · China: 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.
My eSIM
78%50 GB left
Days left20
Top up+10 GB
Data dashboard on Developers · China: 78% 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.
Tele Agent
Will my phone work in China?
If it's carrier-unlocked and eSIM-capable, yes. I checked China bands — you're covered.
Tele Agent chat on Developers · China — real questions, specific answers, zero telecom jargon.
  1. 1Illustrative speed readout: sample carrier, city and latency figures.
  2. 2The meter demonstrates the readout — figures are examples, not live measurements.
Speed test
196Mbps
5G · China · 90 ms
Illustrative speed readout on Developers · China: 196 Mbps, 90 ms — example figures, not live measurements.
  1. 1Live usage ring: see remaining data at a glance, no mental math.
  2. 2Top-up button sits right where you need it when data runs low.
close up shot of smartphone screen — Developers · China: The food tour: every recommendation looked up on the spot.
Developers · China: The food tour: every recommendation looked up on the spot.
Kyle Karbowski — Developers · China: The departure board flips: gate found, lounge located, all on the eSIM.
Developers · China: The departure board flips: gate found, lounge located, all on the eSIM.
airplane wing above the clouds on a clear day — Developers · China: Build on the same rails the China checkout uses.
Developers · China: Build on the same rails the China checkout uses.
person taking photo at book — Developers · China: Webhooks tell you when data runs low, plans expire, top-ups land.
Developers · China: Webhooks tell you when data runs low, plans expire, top-ups land.
person taking photo of exotic plants with smartphone — Developers · China: Market mornings: look up the dish, translate the menu, pay by phone.
Developers · China: Market mornings: look up the dish, translate the menu, pay by phone.
a woman inside a restaurant using a laptop — Developers · China: Coast roads and country lanes — the map keeps up wherever you roam.
Developers · China: Coast roads and country lanes — the map keeps up wherever you roam.
a portrait of a woman wearing a headset — Developers · China: The long layover: streaming, working and messaging, all covered.
Developers · China: The long layover: streaming, working and messaging, all covered.
black and white eiffel tower framed by trees — Developers · China: Museum afternoons with audio guides streaming, not buffering.
Developers · China: Museum afternoons with audio guides streaming, not buffering.
aerial photography of concrete buildings near sea under grey clouds and blue sky — Developers · China: The docs ship with runnable examples, not pseudocode.
Developers · China: The docs ship with runnable examples, not pseudocode.
Maarten van den Heuvel — Developers · China: Rate limits are generous and documented — no surprise 429s.
Developers · China: Rate limits are generous and documented — no surprise 429s.
JACK REDGATE — Developers · China: Currency exchange, skipped: the phone pays at the real rate.
Developers · China: Currency exchange, skipped: the phone pays at the real rate.
amazed daughter and mother in airport hallway — Developers · China: The window seat office: emails sent somewhere over the ocean.
Developers · China: The window seat office: emails sent somewhere over the ocean.
Person photographing a beautiful mountain lake view with a smartphone, enjoying outdoor adventure. — Developers · China: The business trip: client deck synced, video call joined from the taxi.
Developers · China: The business trip: client deck synced, video call joined from the taxi.
people walking on shore — Developers · China: Sunrise hikes start with a weather check — data on, boots on.
Developers · China: Sunrise hikes start with a weather check — data on, boots on.
Kristian Bechthold — Developers · China: API keys rotate in one click — the dashboard makes it boring.
Developers · China: API keys rotate in one click — the dashboard makes it boring.
church on santorini — Developers · China: Border crossings without the paperwork shuffle: ID photos stored on the phone.
Developers · China: Border crossings without the paperwork shuffle: ID photos stored on the phone.
Jess Loiterton — Developers · China: The museum queue skips itself: tickets bought online, straight to the door.
Developers · China: The museum queue skips itself: tickets bought online, straight to the door.
Serene Rural Dirt Pathway Leading Through Countryside — Developers · China: Migrate from Twilio in three steps — the toolkit does the heavy lifting.
Developers · China: Migrate from Twilio in three steps — the toolkit does the heavy lifting.
vibrant night street scene in shibuya tokyo — Developers · China: Rain or shine, the connection holds — weather doesn't throttle data.
Developers · China: Rain or shine, the connection holds — weather doesn't throttle data.
Jessica Wolfie — Developers · China: Duty-free browsing: price-checked against home before buying.
Developers · China: Duty-free browsing: price-checked against home before buying.

Explainer

esimgomobile Developers: the full picture

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.

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.

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.

Explainer

How it works, step by step

  1. Pick your plan
    • Choose data for your trip length — 5 GB covers a long weekend, 20 GB a fortnight, 50 GB or Unlimited a month of heavy use.
    • Checkout takes about two minutes through the secure Amazon Pay checkout.
  2. Scan the QR code
    • Your eSIM arrives instantly. Open your phone camera, scan, and the plan installs itself.
    • No store visit, no plastic SIM, no waiting for the post.
  3. Land connected
    • Turn on data roaming for the eSIM line when you land — you're online before baggage claim.
    • The eSIM finds the local partner network automatically.

Explainer

Good to know

  • Download offline maps for your destination — they save data and work in dead zones.
  • Hotspot sparingly: one laptop tethered all day can burn through a week of phone data.
  • Charge your phone before long travel days; weak signal areas drain batteries faster.
  • If a page won't load, toggle airplane mode for ten seconds — it forces a fresh network attach.
  • Buy and install your eSIM before departure — airport Wi-Fi is the worst place to set up connectivity.
  • Set a data alert at 80% so a top-up never surprises you mid-trip.

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

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

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.

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

Every chart that matters for China.

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.
Who it's forFour travelers, one toolWho it's forBuilt for real trip shapes, not personas.1The family organizer
One tool, every traveler's needs covered.
esimgomobile network data2The planner
Compare before you commit — know the right plan weeks ahead.
esimgomobile network data3The last-minute flyer
Answer in minutes, eSIM installed before boarding.
esimgomobile network data4The remote worker
Size data for video calls and hotspotting with confidence.
esimgomobile network data
Use cases. Six traveler shapes, one tool — Developers · China's use cases.
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.1Pick your planChoose data for your trip — checkout takes about two minutes.2Scan the QR codeThe eSIM installs straight onto your phone. No store, no plastic SIM.3Land connectedSwitch the line on when you arrive — online before baggage claim.
Three-step setup. Buy, scan, land: the whole sequence fits in a coffee queue.
Every plan includesNo tiers of basic dignity — these ship with all plansEvery plan includesThe baseline is generous on purpose.24/7 supportReal humans plus the Tele Agent, around the clock.6 languagesThe app speaks your language, wherever you're from.Hotspot includedShare with your laptop or tablet at no extra cost.5G where availableFastest local partner network, selected automatically.Keep your WhatsAppYour existing number keeps working on the data line.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.
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. A 20 GB plan covers roughly two weeks of normal travel use.
Plan comparison matrixEvery plan for China — data, validity, best fitPlans at a glanceFour prepaid plans cover every kind of trip to China.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. Developers · China: four plans, four trip shapes — the matrix carries no fine print.
Pro tipsFour habits of the always-connectedPro tipsSmall habits, big difference.1Set an 80% alertA top-up should never surprise you mid-trip.2Install before you flyAirport Wi-Fi is the worst place to set up connectivity.3Screenshot bookingsHotel address & confirmations, available with no signal.4Check unlock statusCarrier-locked phones can't add an eSIM — verify first.
Pro tips. Veterans do all four without thinking.
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.2Apply itJump straight to the plan, setting or page it points to.3Get the answerClear result with next steps — save it or act on it.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.
Network at a glanceCoverage facts for ChinaNetwork at a glanceThe numbers that matter before you buy.195destinations liveesimgomobile network data5Gwhere available in Chinaesimgomobile 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. The network resume for Developers · China: 195 destinations, 5G where available, six languages.
esimgomobile Developers: capability profileWhat the tool is good at — illustrative profileCapability profileFive strengths, ranked by what users feel first.Private by designyour inputs stay in your browserShares wellsend the answer to travel companionsAlways currentreflects live plans and coverageInstant resultsno waiting, no signupMobile friendlyworks on the phone in your handIllustrative profile based on tool design — not measured telemetry.
Capability profile. What Developers · China does best — the capability profile, honestly ranked.
Questions, answeredThe six things everyone asks firstQuestions, answeredShort answers, no sales pitch.How fast is setup?
About two minutes: plan, QR scan, done.
Which phones work?
Any carrier-unlocked, eSIM-capable iPhone or Android.
Is it a contract?
No — prepaid. Service simply stops instead of charging extra.
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.
Do I keep my number?
Yes — WhatsApp & iMessage keep working on your existing number.
FAQ at a glance. Six questions every traveler asks — the Developers · China answers, one screen.

Take China with you, connected

Pick a plan, check out securely, scan the QR code — you're online before you land.

See plans and pricing Talk to the Tele Agent