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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 Vietnam

Using developers in Vietnam? You are on the local edition — key facts for Vietnam (capital Hanoi, dial code +84) are below. esimgomobile plans for Vietnam are live now — monthly plans from $8/mo and one-time travel packs from $3.65, with live checkout.

CapitalHanoi
Dial code+84
CurrencyVietnamese đồng (VND)
Time zoneUTC+7
Main languagesVietnamese

Plans are live — see plans and pricing.

Inside the app

The product, up close.

Twenty product screens and twenty field photos — this is what traveling connected looks like.

Vietnam · 5G
Signal widget on Developers · Vietnam: network generation and place, always visible.
  1. 1The plan chip: name, allowance and destination in one line.
  2. 2Everything you need to confirm you're on the right plan.
45%
data left
Usage ring on Developers · Vietnam — 45% of data left: the number travelers check most.
  1. 1Signal widget: network generation and destination, always visible.
  2. 2Five bars, zero ambiguity about what you're connected to.
Tele Agent
“Setting up your Vietnam line…”
AI voice agent on Developers · Vietnam — answers spoken aloud, never a support ticket.
  1. 1The Tele Agent answers in plain language — no telecom jargon.
  2. 2Every answer is specific to your trip, not a generic FAQ.
Virtual number
+1 205 484 5257
Routes toVietnam
SMS + voiceEnabled
Your second line on Developers · Vietnam: +1 205 484 5257 — 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.
close up shot of a couple standing near luggages
“Switched plans mid-trip in Vietnam. Took about a minute.”
Yuki N.Verified traveler · Vietnam
Traveler review for Developers · Vietnam: “Switched plans mid-trip in Vietnam. Took about a minute.” — Yuki N..
  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 eSIMs2
Data left10 GB
Current cityVietnam
Web dashboard on Developers · Vietnam: every eSIM, every trip, 10 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.
Vietnam · coverage
5 carriers · automatic selection
Coverage map on Developers · Vietnam: 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.
Launch facts
195destinations live
31free tools
$8entry monthly plan
Launch facts behind Developers · Vietnam — 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.
Recent speeds
Istanbul162 Mbps
New York350 Mbps
Bali506 Mbps
Recent speeds for Developers · Vietnam — Istanbul, New York, Bali: 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?
esimgomobile.com
Plans for Vietnam
Atlas 5GB5 GB · 30 days
Atlas 20GB20 GB · 30 days
Atlas 50GB50 GB · 60 days
Compare plans
Plan picker on Developers · Vietnam: 5GB, 20GB, 50GB and Unlimited — pick by trip, not 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 · Vietnam
The honest comparison on Developers · Vietnam: 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.
eSIM installedYour Vietnam plan is ready.
Push · just now
Push notification on Developers · Vietnam: eSIM installed, plan ready to activate.
  1. 1A real traveler quote, tied to the destination it mentions.
  2. 2Reviews reference actual trips, not generic praise.
Why travelers pick it
  • Hotspot included
  • Keep WhatsApp number
  • Instant QR install
Why travelers pick Developers · Vietnam: Hotspot included, Keep WhatsApp number, Instant QR install.
  1. 1A real traveler quote, tied to the destination it mentions.
  2. 2Reviews reference actual trips, not generic praise.
Language
EnglishPortuguêsDeutsch
Language picker on Developers · Vietnam — English, Português, Deutsch: 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.
195
destinations live
launch fact
Launch fact behind Developers · Vietnam: 195 destinations live — a fixed figure, not live telemetry.
  1. 1A real traveler quote, tied to the destination it mentions.
  2. 2Reviews reference actual trips, not generic praise.
two men and one woman jumping near shore
Pack light. Stay connected in Vietnam.
Get your eSIM
Live now · no waitlist
“Pack light. Stay connected in Vietnam.” — the CTA card on Developers · Vietnam: plans live now, no waitlist.
  1. 1Coverage status at a glance: data live, number available, 5G ready.
  2. 2Green means go — no guessing about what's supported.
a man looking at mountains
Your Vietnam number is waiting.
Get your eSIM
“Your Vietnam number is waiting.” — the banner on Developers · Vietnam: 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?
My eSIM
74%5 GB left
Days left16
Top up+10 GB
Data dashboard on Developers · Vietnam: 74% remaining, days left, top-up one tap away.
  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.
Tele Agent
Will my phone work in Vietnam?
If it's carrier-unlocked and eSIM-capable, yes. I checked Vietnam bands — you're covered.
Tele Agent chat on Developers · Vietnam — real questions, specific answers, zero telecom jargon.
  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.
Network
5G
Vietnam connected
Network widget for Developers · Vietnam: 5G, full bars — zero ambiguity about the connection.
  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.
view of the eifel tower from the street — Developers · Vietnam: Coworking abroad: laptop tethered, calls crisp, deadlines met.
Developers · Vietnam: Coworking abroad: laptop tethered, calls crisp, deadlines met.
vibrant tokyo alley at night — Developers · Vietnam: Hiking the ridge: trail map offline, emergency numbers saved.
Developers · Vietnam: Hiking the ridge: trail map offline, emergency numbers saved.
Josh Sorenson — Developers · Vietnam: Lost in the medina, found by GPS: the blue dot never lies.
Developers · Vietnam: Lost in the medina, found by GPS: the blue dot never lies.
woman with red cap talking on laptop — Developers · Vietnam: The last night: photo album backed up, memories safe before wheels-up.
Developers · Vietnam: The last night: photo album backed up, memories safe before wheels-up.
Nikita Grishin — Developers · Vietnam: Old town, new tricks: translation apps working in real time.
Developers · Vietnam: Old town, new tricks: translation apps working in real time.
white jet on black tarmac — Developers · Vietnam: Migrate from Twilio in three steps — the toolkit does the heavy lifting.
Developers · Vietnam: Migrate from Twilio in three steps — the toolkit does the heavy lifting.
blank smartphone screen in modern office setting — Developers · Vietnam: Market mornings: look up the dish, translate the menu, pay by phone.
Developers · Vietnam: Market mornings: look up the dish, translate the menu, pay by phone.
Jess Loiterton — Developers · Vietnam: Rooftop check-in: boarding passes and hotel keys, all on the phone.
Developers · Vietnam: Rooftop check-in: boarding passes and hotel keys, all on the phone.
car on street in city at night — Developers · Vietnam: The night bus: entertainment downloaded, messages queued, rest easy.
Developers · Vietnam: The night bus: entertainment downloaded, messages queued, rest easy.
a woman sitting with a laptop — Developers · Vietnam: Golden hour, fully online — photo backups upload before dinner.
Developers · Vietnam: Golden hour, fully online — photo backups upload before dinner.
AMITR MEENA (AMMY) — Developers · Vietnam: Webhooks tell you when data runs low, plans expire, top-ups land.
Developers · Vietnam: Webhooks tell you when data runs low, plans expire, top-ups land.
Young woman backpacker taking a selfie on a white background, dressed in outdoor gear. — Developers · Vietnam: Night markets and late trains — connected the whole way through.
Developers · Vietnam: Night markets and late trains — connected the whole way through.
aerial view from plane window showing clouds — Developers · Vietnam: Coast roads and country lanes — the map keeps up wherever you roam.
Developers · Vietnam: Coast roads and country lanes — the map keeps up wherever you roam.
Man taking photo out of airplane window, capturing wing view with smartphone. — Developers · Vietnam: Border crossings without the paperwork shuffle: ID photos stored on the phone.
Developers · Vietnam: Border crossings without the paperwork shuffle: ID photos stored on the phone.
woman in pink blouse texting on a smartphone — Developers · Vietnam: SDKs, a CLI, and an MCP server — the developer surface, complete.
Developers · Vietnam: SDKs, a CLI, and an MCP server — the developer surface, complete.
aircraft wings through window — Developers · Vietnam: Trailheads and lookouts: offline maps downloaded, just in case.
Developers · Vietnam: Trailheads and lookouts: offline maps downloaded, just in case.
clouds seen from an airplane — Developers · Vietnam: The viewpoint at golden hour: livestream the sunset to everyone back home.
Developers · Vietnam: The viewpoint at golden hour: livestream the sunset to everyone back home.
woman standing in front of a laptop — Developers · Vietnam: The status page is public — uptime you can verify, not claim.
Developers · Vietnam: The status page is public — uptime you can verify, not claim.
the road to jasper — Developers · Vietnam: The sunrise ferry: tickets in the wallet app, timetable cached offline.
Developers · Vietnam: The sunrise ferry: tickets in the wallet app, timetable cached offline.
Roy Serafin — Developers · Vietnam: Real journeys, real connectivity — this is what the product is for.
Developers · Vietnam: Real journeys, real connectivity — this is what the product is for.

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 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.

Explainer

How it works, step by step

  1. Buy before you fly
    • Order from home, the hotel, or the departure lounge — delivery is instant and digital.
    • No shipping, no pickup counters, no airport SIM queues.
  2. Add the eSIM
    • One QR scan adds the plan to your phone. iPhone and Android both walk you through it in under a minute.
    • You can install now and activate later — the plan starts when you choose.
  3. Stay online abroad
    • Data, maps, translation and messaging work the moment you land.
    • Running low? Top up in one tap from your dashboard — no new QR code needed.

Explainer

Good to know

  • Turn off auto-play on social apps before you fly; it quietly eats roaming data.
  • Charge your phone before long travel days; weak signal areas drain batteries faster.
  • Check that your phone is carrier-unlocked before you buy any eSIM — locked phones can't add one.
  • Keep your home SIM active for two-factor codes from your bank; run data on the eSIM line.
  • Buy and install your eSIM before departure — airport Wi-Fi is the worst place to set up connectivity.
  • WhatsApp, iMessage and FaceTime keep your existing number on a data eSIM — no need to tell anyone a new number.

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.

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.

Visual guides

The numbers behind Vietnam.

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.
Pro tipsFour habits of the always-connectedPro tipsSmall habits, big difference.1Check unlock statusCarrier-locked phones can't add an eSIM — verify first.2Install before you flyAirport Wi-Fi is the worst place to set up connectivity.3Set an 80% alertA top-up should never surprise you mid-trip.4Keep home SIM for 2FABank codes still arrive while data runs on the eSIM.
Pro tips. Veterans do all four without thinking.
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 · Vietnam's use cases.
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.
How fast is setup?
About two minutes: plan, QR scan, done.
Is it a contract?
No — prepaid. Service simply stops instead of charging extra.
Which phones work?
Any carrier-unlocked, eSIM-capable iPhone or Android.
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.
FAQ at a glance. Still curious? The Tele Agent answers anything else instantly.
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.Keep your WhatsAppYour existing number keeps working on the data line.One-tap top-upMore data in seconds — no new QR code.6 languagesThe app speaks your language, wherever you're from.5G where availableFastest local partner network, selected automatically.Hotspot includedShare with your laptop or tablet at no extra cost.
Included with every plan. Six things ship with every plan — the Developers · Vietnam baseline, generous on purpose.
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. Gigabytes translated into hours — the Developers · Vietnam usage guide.
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. Three steps, about two minutes — the Developers · Vietnam ritual, no store visit.
Plan comparison matrixEvery plan for Vietnam — data, validity, best fitPlans at a glanceFour prepaid plans cover every kind of trip to Vietnam.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. Weekend sips, fortnight data, work-month gulps, or unlimited — pick by trip shape.
Network at a glanceCoverage facts for VietnamNetwork at a glanceThe numbers that matter before you buy.195destinations liveesimgomobile network data5Gwhere available in Vietnamesimgomobile 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.
esimgomobile Developers: capability profileWhat the tool is good at — illustrative profileCapability profileFive strengths, ranked by what users feel first.Shares wellsend the answer to travel companionsMobile friendlyworks on the phone in your handAlways currentreflects live plans and coverageInstant resultsno waiting, no signupPrivate by designyour inputs stay in your browserIllustrative profile based on tool design — not measured telemetry.
Capability profile. Ranked by what travelers notice first, not by marketing priority.
How esimgomobile Developers worksFour steps from question to answerHow this tool worksBuilt to answer one question well.1Open the toolNo account needed — it loads instantly in your browser.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.4Enter your detailsTrip, data needs, destination. The tool does the math.
Tool walkthrough. Four steps from landing on Developers · Vietnam to having your answer.

Your Vietnam plan is two minutes away

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