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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 Belgium

Using developers in Belgium? You are on the local edition — key facts for Belgium (capital Brussels, dial code +32) are below. esimgomobile plans for Belgium are live now — monthly plans from $8/mo and one-time travel packs from $3.65, with live checkout.

CapitalBrussels
Dial code+32
CurrencyEuro (EUR)
Time zoneUTC+1
Main languagesDutch, French, German

Plans are live — see plans and pricing.

Product tour

The product, up close.

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

Virtual number
+1 205 642 0356
Routes toBelgium
SMS + voiceEnabled
Your second line on Developers · Belgium: +1 205 642 0356 — real number, SMS and voice enabled.
  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":"BE"}'
200 OK · 48 ms
REST API behind Developers · Belgium: issue eSIMs programmatically — 200 OK in milliseconds.
  1. 1Three plans side by side so the trade-off is obvious.
  2. 2Pick by trip length, not by decoding fine print.
man using laptop computer
Your Belgium number is waiting.
Get your eSIM
“Your Belgium number is waiting.” — the banner on Developers · Belgium: two minutes from curious to connected.
  1. 1Coverage pins show where partner networks are live.
  2. 2The map answers the only question that matters: will it work there?
Belgium · coverage
5 carriers · automatic selection
Coverage map on Developers · Belgium: partner networks pinned, selection automatic.
  1. 1Mockups illustrate the product flow — captions describe what's real.
  2. 2Figures labeled as examples show sample data, never live telemetry.
esimgomobile.com
Elia Vigolo
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.
My eSIM
49%10 GB left
Days left28
Top up+10 GB
Data dashboard on Developers · Belgium: 49% remaining, days left, top-up one tap away.
  1. 1The plan card shows exactly what you're buying — data, days, destination.
  2. 2One tap starts the two-minute QR install.
Install
1 Scan2 Add3 Go
The Developers · Belgium install: QR in three steps — scan, add, go, about two minutes.
  1. 1The plan card shows exactly what you're buying — data, days, destination.
  2. 2One tap starts the two-minute QR install.
Coverage
195
destinations live
Belgium5G ready
Check coverage
Coverage at a glance for Developers · Belgium: 195 destinations live, fastest local partner selected on its own.
  1. 1The Tele Agent answers in plain language — no telecom jargon.
  2. 2Every answer is specific to your trip, not a generic FAQ.
24%
data left
Usage ring on Developers · Belgium — 24% of data left: the number travelers check most.
  1. 1The plan chip: name, allowance and destination in one line.
  2. 2Everything you need to confirm you're on the right plan.
Launch facts
195destinations live
31free tools
$8entry monthly plan
Launch facts behind Developers · Belgium — 195 destinations live, 31 free tools, $8 entry monthly plan: numbers we publish and stand behind.
  1. 1A real support transcript: the question, then the specific answer.
  2. 2This is what 'AI support' actually looks like in practice.
Belgium · 5G
Signal widget on Developers · Belgium: network generation and place, always visible.
  1. 1Signal widget: network generation and destination, always visible.
  2. 2Five bars, zero ambiguity about what you're connected to.
Support
How does Developers · Belgium work?
Enter your trip details and get an instant answer — no account needed.
Support snippet — Developers · Belgium: what it does, in one honest answer.
  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 · Belgium
The honest comparison on Developers · Belgium: 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.
Tele Agent
Will my phone work in Belgium?
If it's carrier-unlocked and eSIM-capable, yes. I checked Belgium bands — you're covered.
Tele Agent chat on Developers · Belgium — 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.
Atlas 20GB
20 GB · 30 days
Belgium
Atlas 20GB — 20 GB · 30 days, prepaid and ready on Developers · Belgium.
  1. 1Signal widget: network generation and destination, always visible.
  2. 2Five bars, zero ambiguity about what you're connected to.
Tolga Utangan
Ready for Belgium?
Get your eSIM
Live now · no waitlist
“Ready for Belgium?” — the CTA card on Developers · Belgium: plans live now, no waitlist.
  1. 1A real traveler quote, tied to the destination it mentions.
  2. 2Reviews reference actual trips, not generic praise.
Speed test
383Mbps
5G · Belgium · 47 ms
Illustrative speed readout on Developers · Belgium: 383 Mbps, 47 ms — example figures, not live measurements.
  1. 1The plan card shows exactly what you're buying — data, days, destination.
  2. 2One tap starts the two-minute QR install.
an empty street at night
Belgium
eSIM dataLive
Local numberAvailable
5GYes
Coverage card on Developers · Belgium: data live, local number available, 5G where it exists.
  1. 1Coverage status at a glance: data live, number available, 5G ready.
  2. 2Green means go — no guessing about what's supported.
esimgomobile.com
Dashboard
Active eSIMs3
Data left20 GB
Current cityBelgium
Web dashboard on Developers · Belgium: every eSIM, every trip, 20 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.
eiffel tower paris france
“The Belgium number saved me at the rental counter — they called, I answered.”
Priya S.Verified traveler · Belgium
Traveler review for Developers · Belgium: “The Belgium number saved me at the rental counter — they called, I answered.” — Priya S..
  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.
view from airplane window with cloudscape — Developers · Belgium: The viewpoint at golden hour: livestream the sunset to everyone back home.
Developers · Belgium: The viewpoint at golden hour: livestream the sunset to everyone back home.
teddy bear sitting atop luggage left in airport — Developers · Belgium: The night bus: entertainment downloaded, messages queued, rest easy.
Developers · Belgium: The night bus: entertainment downloaded, messages queued, rest easy.
photo of a person holding a smartphone — Developers · Belgium: The welcome home: eSIM deleted in one tap, no contract to cancel.
Developers · Belgium: The welcome home: eSIM deleted in one tap, no contract to cancel.
Anthony Borshon Gomes — Developers · Belgium: Check-in lines move faster when your documents are on your phone.
Developers · Belgium: Check-in lines move faster when your documents are on your phone.
close up shot of smartphone screen — Developers · Belgium: Sandbox first: test provisioning without spending a cent.
Developers · Belgium: Sandbox first: test provisioning without spending a cent.
Pok Rie — Developers · Belgium: Golden hour, fully online — photo backups upload before dinner.
Developers · Belgium: Golden hour, fully online — photo backups upload before dinner.
hiker admiring majestic albanian mountains — Developers · Belgium: The docs ship with runnable examples, not pseudocode.
Developers · Belgium: The docs ship with runnable examples, not pseudocode.
the view of the ocean from the top of a hill — Developers · Belgium: The status page is public — uptime you can verify, not claim.
Developers · Belgium: The status page is public — uptime you can verify, not claim.
hiker trekking in lush hills of rudra nath — Developers · Belgium: Island time, online time: ferries, beaches and full signal.
Developers · Belgium: Island time, online time: ferries, beaches and full signal.
Palm Trees Near Beach — Developers · Belgium: City lights after dark — the eSIM doesn't care what time it is.
Developers · Belgium: City lights after dark — the eSIM doesn't care what time it is.
eiffel tower in paris — Developers · Belgium: Migrate from Twilio in three steps — the toolkit does the heavy lifting.
Developers · Belgium: Migrate from Twilio in three steps — the toolkit does the heavy lifting.
vibrant nightlife scene in shinjuku tokyo — Developers · Belgium: Platform to platform: tickets, timetables and taxis in one hand.
Developers · Belgium: Platform to platform: tickets, timetables and taxis in one hand.
Alexey Chudin — Developers · Belgium: The food tour: every recommendation looked up on the spot.
Developers · Belgium: The food tour: every recommendation looked up on the spot.
close up of women in an office signing documents — Developers · Belgium: From departure lounge to arrival hall, the data never drops.
Developers · Belgium: From departure lounge to arrival hall, the data never drops.
male hiker standing on the rock overlooking the green mountains — Developers · Belgium: Build on the same rails the Belgium checkout uses.
Developers · Belgium: Build on the same rails the Belgium checkout uses.
brooklyn bridge in front of skyscrapers in new york city usa — Developers · Belgium: Souvenir hunting with live currency conversion in your pocket.
Developers · Belgium: Souvenir hunting with live currency conversion in your pocket.
woman walking on pathway while strolling luggage — Developers · Belgium: Coworking abroad: laptop tethered, calls crisp, deadlines met.
Developers · Belgium: Coworking abroad: laptop tethered, calls crisp, deadlines met.
Elia Vigolo — Developers · Belgium: Currency exchange, skipped: the phone pays at the real rate.
Developers · Belgium: Currency exchange, skipped: the phone pays at the real rate.
stein egil liland — Developers · Belgium: Plazas and promenades: video calls home with the view behind you.
Developers · Belgium: Plazas and promenades: video calls home with the view behind you.
woman doing paperwork — Developers · Belgium: Downtown, connected: the eSIM finds the fastest local network on its own.
Developers · Belgium: Downtown, connected: the eSIM finds the fastest local network on its own.

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

  • Charge your phone before long travel days; weak signal areas drain batteries faster.
  • 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.
  • WhatsApp, iMessage and FaceTime keep your existing number on a data eSIM — no need to tell anyone a new number.
  • If a page won't load, toggle airplane mode for ten seconds — it forces a fresh network attach.
  • Turn off auto-play on social apps before you fly; it quietly eats roaming data.

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

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

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 data room

The numbers behind Belgium.

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 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 remote worker
Size data for video calls and hotspotting with confidence.
esimgomobile network data
Use cases. Six traveler shapes, one tool — Developers · Belgium's use cases.
Every plan includesNo tiers of basic dignity — these ship with all plansEvery plan includesThe baseline is generous on purpose.One-tap top-upMore data in seconds — no new QR code.24/7 supportReal humans plus the Tele Agent, around the clock.Hotspot includedShare with your laptop or tablet at no extra cost.Keep your WhatsAppYour existing number keeps working on the data line.6 languagesThe app speaks your language, wherever you're from.5G where availableFastest local partner network, selected automatically.
Included with every plan. From 5 GB to Unlimited, the inclusions don't shrink.
Plan comparison matrixEvery plan for Belgium — data, validity, best fitPlans at a glanceFour prepaid plans cover every kind of trip to Belgium.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 · Belgium: four plans, four trip shapes — the matrix carries no fine print.
Questions, answeredThe six things everyone asks firstQuestions, answeredShort answers, no sales pitch.Which phones work?
Any carrier-unlocked, eSIM-capable iPhone or Android.
Do I keep my number?
Yes — WhatsApp & iMessage keep working on your existing number.
Does hotspot work?
Yes — share your connection with laptop or tablet.
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.
How fast is setup?
About two minutes: plan, QR scan, done.
FAQ at a glance. Still curious? The Tele Agent answers anything else instantly.
How esimgomobile Developers worksFour steps from question to answerHow this tool worksBuilt to answer one question well.1Apply itJump straight to the plan, setting or page it points to.2Enter your detailsTrip, data needs, destination. The tool does the math.3Open the toolNo account needed — it loads instantly in your browser.4Get the answerClear result with next steps — save it or act on it.
Tool walkthrough. Every tool on esimgomobile follows the same honest pattern: input, math, answer.
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.
esimgomobile Developers: capability profileWhat the tool is good at — illustrative profileCapability profileFive strengths, ranked by what users feel first.Always currentreflects live plans and coverageShares wellsend the answer to travel companionsMobile friendlyworks on the phone in your handInstant resultsno waiting, no signupPrivate by designyour inputs stay in your browserIllustrative profile based on tool design — not measured telemetry.
Capability profile. Capabilities measured by traveler value, not feature count.
Network at a glanceCoverage facts for BelgiumNetwork at a glanceThe numbers that matter before you buy.195destinations liveesimgomobile network data5Gwhere available in Belgiumesimgomobile 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. Belgium connects to the fastest available local partner network automatically.
Pro tipsFour habits of the always-connectedPro tipsSmall habits, big difference.1Download offline mapsThey save data and work in dead zones.2Keep home SIM for 2FABank codes still arrive while data runs on the eSIM.3Install before you flyAirport Wi-Fi is the worst place to set up connectivity.4Check unlock statusCarrier-locked phones can't add an eSIM — verify first.
Pro tips. The small things that separate smooth trips from stressful ones.
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.1Scan the QR codeThe eSIM installs straight onto your phone. No store, no plastic SIM.2Pick your planChoose data for your trip — checkout takes about two minutes.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.

Ready when Belgium is

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