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Documentation

Learn it once. Connect everywhere.

Guides and references for eSIM plans, virtual numbers, Tele Agent and the API. Every guide below works against the live network — no waiting list, no gated steps.

Start here

Quickstarts

Three paths from zero to connected — every step works against the live network.

Buy your first eSIM

  1. Create your account — pick a plan, live now.
  2. Pick a plan and check out — live now.
  3. Scan the QR code to install the eSIM.

Set up a team plan

  1. Create your account — pick a plan, live now.
  2. Create your workspace and invite the team.
  3. Assign numbers and data pools per line.

Build on the developer API

  1. Mint a developer API key (self-serve) — live now.
  2. Read the OpenAPI 3.1 document — live now.
  3. Subscribe to com.esimgomobile.* webhooks for billing, porting, number and call events — live now.
  4. Automate top-ups per line.
Shortcuts

Popular right now

Check device compatibility→ Installation guide→ Coverage by country→ API & developers→ System status→ Pricing→ eSIM plans→ Virtual numbers→ Tele Agent→
Platform

The platform, in five parts

Coverage

195 country guides with install steps and local network notes.

Read →

Plans

Data plus a permanent phone number on one eSIM line.

Read →

Numbers

Real virtual numbers for calls, SMS and verification codes.

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Tele Agent

An AI receptionist that answers, books and summarizes calls.

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API

Catalog, checkout, account, QR, balance, numbers and Tele Agent endpoints.

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For builders

Developer platform — live today

Self-serve API keys, a published OpenAPI 3.1 document, JavaScript and Python SDKs, a CLI, com.esimgomobile.* webhooks, a number-porting API, KYC intake and an honest status page. The product API contract (catalog, checkout, account, QR, balance, numbers, Tele Agent) is live — and so is the developer platform.

Build on the API System status

History

What shipped

Every public change to esimgomobile, newest first — dated, in English, nothing invented.

Read the changelog

Keep exploring

More resources

Blog→ Tools hub→ Pricing→ Status→ Support→

esimgomobile in Holy See

Using docs in Holy See? You are on the local edition — key facts for Holy See (capital Vatican City, dial code +379) are below. esimgomobile plans for Holy See are live now — monthly plans from $8/mo and one-time travel packs from $3.65, with live checkout.

CapitalVatican City
Dial code+379
CurrencyEuro (EUR)
Time zoneUTC+1
Main languagesItalian, Latin

Plans are live — see plans and pricing.

The experience

esimgomobile in action.

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

vs roaming
esimgomobile eSIMone price
Carrier roamingper-day fees
10 GB · 14 days · Holy See
The honest comparison on Docs · Holy See: 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.
Atlas 20GB
20 GB · 30 days
Holy See
Atlas 20GB — 20 GB · 30 days, prepaid and ready on Docs · Holy See.
  1. 1Usage ring compresses the whole plan into one glanceable number.
  2. 2Percent remaining is the only metric most travelers check.
Virtual number
+1 205 545 2136
Routes toHoly See
SMS + voiceEnabled
Your second line on Docs · Holy See: +1 205 545 2136 — 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.
Support
How does Docs · Holy See work?
Enter your trip details and get an instant answer — no account needed.
Support snippet — Docs · Holy See: what it does, in one honest answer.
  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.
Speed test
386Mbps
5G · Holy See · 59 ms
Illustrative speed readout on Docs · Holy See: 386 Mbps, 59 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.
esimgomobile.com
Man taking photo out of airplane window, capturing wing view with smartphone.
Docs
Travel guides · 8 min read
From the blog: “Docs” — 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.
eSIM installedYour Holy See plan is ready.
Push · just now
Push notification on Docs · Holy See: eSIM installed, plan ready to activate.
  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.
Holy See · coverage
5 carriers · automatic selection
Coverage map on Docs · Holy See: 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
Checkout
Atlas 20GB — Holy Seetotal
Taxescalculated
Pay securely
256-bit encrypted · Amazon Pay
Secure checkout on Docs · Holy See: 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.
My eSIM
58%50 GB left
Days left23
Top up+10 GB
Data dashboard on Docs · Holy See: 58% 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.
Install
1 Scan2 Add3 Go
The Docs · Holy See 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.
Network
5G
Holy See connected
Network widget for Docs · Holy See: 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.
esimgomobile.com
API quickstart
curl https://api.esimgomobile.com/v1/esims \
  -H "Authorization: Bearer $KEY" \
  -d '{"country":"HO"}'
200 OK · 44 ms
REST API behind Docs · Holy See: 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.
Hb zee
Your Holy See number is waiting.
Get your eSIM
Live now · no waitlist
“Your Holy See number is waiting.” — the CTA card on Docs · Holy See: plans live now, no waitlist.
  1. 1A real traveler quote, tied to the destination it mentions.
  2. 2Reviews reference actual trips, not generic praise.
Launch facts
195destinations live
31free tools
$8entry monthly plan
Launch facts behind Docs · Holy See — 195 destinations live, 31 free tools, $8 entry monthly plan: numbers we publish and stand behind.
  1. 1Coverage pins show where partner networks are live.
  2. 2The map answers the only question that matters: will it work there?
esimgomobile.com
Dashboard
Active eSIMs4
Data left50 GB
Current cityHoly See
Web dashboard on Docs · Holy See: every eSIM, every trip, 50 GB left — one screen.
  1. 1Checkout shows the full price before you pay. Nothing hidden.
  2. 2Amazon Pay handles payment securely; taxes are calculated for you.
miniature eiffel tower reflected on wet surface
Get connected
1 Pick a plan2 Scan QR3 Land online
Three steps on Docs · Holy See: 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.
a close up shot of a headset
“The Holy See number saved me at the rental counter — they called, I answered.”
Chris D.Verified traveler · Holy See
Traveler review for Docs · Holy See: “The Holy See number saved me at the rental counter — they called, I answered.” — Chris D..
  1. 1Coverage status at a glance: data live, number available, 5G ready.
  2. 2Green means go — no guessing about what's supported.
eSIM plan
Atlas 20GB20 GB · 30 days
Holy See
Install eSIM
Atlas 20GB on Docs · Holy See — 20 GB · 30 days, prepaid with the full price shown before you pay.
  1. 1Illustrative speed readout: sample carrier, city and latency figures.
  2. 2The meter demonstrates the readout — figures are examples, not live measurements.
Tele Agent
What happens when my data runs out in Holy See?
You get a heads-up at 80%, then one-tap top-up. No roaming-bill surprises in Holy See.
Tele Agent chat on Docs · Holy See — real questions, specific answers, zero telecom jargon.
  1. 1The plan card shows exactly what you're buying — data, days, destination.
  2. 2One tap starts the two-minute QR install.
man sitting on sofa talking on webcam on laptop — Docs · Holy See: From departure lounge to arrival hall, the data never drops.
Docs · Holy See: From departure lounge to arrival hall, the data never drops.
天玑 不器 — Docs · Holy See: The long layover: streaming, working and messaging, all covered.
Docs · Holy See: The long layover: streaming, working and messaging, all covered.
man drinking coffee while working on his laptop — Docs · Holy See: Check-in lines move faster when your documents are on your phone.
Docs · Holy See: Check-in lines move faster when your documents are on your phone.
Senior tourists photographing scenic landscape in Cappadocia, Türkiye under a sun umbrella on a sunny day. — Docs · Holy See: Souvenir hunting with live currency conversion in your pocket.
Docs · Holy See: Souvenir hunting with live currency conversion in your pocket.
Denis Linine — Docs · Holy See: The night bus: entertainment downloaded, messages queued, rest easy.
Docs · Holy See: The night bus: entertainment downloaded, messages queued, rest easy.
aircraft wing in close up shot — Docs · Holy See: The docs answer before you ask — search first, it's fast.
Docs · Holy See: The docs answer before you ask — search first, it's fast.
one world trade center new york — Docs · Holy See: The group chat stays live across every border you cross.
Docs · Holy See: The group chat stays live across every border you cross.
three people working in the office — Docs · Holy See: Night markets and late trains — connected the whole way through.
Docs · Holy See: Night markets and late trains — connected the whole way through.
a group of friends on the seashore — Docs · Holy See: Travelers stay online from the moment they land — no SIM queues, no roaming shock.
Docs · Holy See: Travelers stay online from the moment they land — no SIM queues, no roaming shock.
black smartphone in close up photography — Docs · Holy See: The rental desk handshake: confirmation email open, license photo ready.
Docs · Holy See: The rental desk handshake: confirmation email open, license photo ready.
man hiking in snow in mountains — Docs · Holy See: The window seat office: emails sent somewhere over the ocean.
Docs · Holy See: The window seat office: emails sent somewhere over the ocean.
Young woman backpacker taking a selfie on a white background, dressed in outdoor gear. — Docs · Holy See: Currency exchange, skipped: the phone pays at the real rate.
Docs · Holy See: Currency exchange, skipped: the phone pays at the real rate.
white concrete buildings — Docs · Holy See: Lost in the medina, found by GPS: the blue dot never lies.
Docs · Holy See: Lost in the medina, found by GPS: the blue dot never lies.
contemporary building facades against sea in usa — Docs · Holy See: The Holy See setup guide is three steps because the product is.
Docs · Holy See: The Holy See setup guide is three steps because the product is.
man standing on a grass with snow covered mountains background — Docs · Holy See: Rain or shine, the connection holds — weather doesn't throttle data.
Docs · Holy See: Rain or shine, the connection holds — weather doesn't throttle data.
vibrant night scene of tokyo s neon lit streets — Docs · Holy See: Island time, online time: ferries, beaches and full signal.
Docs · Holy See: Island time, online time: ferries, beaches and full signal.
a man having a video call on his laptop — Docs · Holy See: The red-eye recovery: hotel early-check-in arranged mid-flight.
Docs · Holy See: The red-eye recovery: hotel early-check-in arranged mid-flight.
eiffel tower with trees in paris france — Docs · Holy See: The docs are versioned — what you read matches what you run.
Docs · Holy See: The docs are versioned — what you read matches what you run.
people sitting at an airport — Docs · Holy See: Plazas and promenades: video calls home with the view behind you.
Docs · Holy See: Plazas and promenades: video calls home with the view behind you.
Zizi zi — Docs · Holy See: Sunrise hikes start with a weather check — data on, boots on.
Docs · Holy See: Sunrise hikes start with a weather check — data on, boots on.

Explainer

Docs: the full picture

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.

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. 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

  • If a page won't load, toggle airplane mode for ten seconds — it forces a fresh network attach.
  • Set a data alert at 80% so a top-up never surprises you mid-trip.
  • 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.
  • Save your eSIM QR code somewhere safe (email it to yourself) in case you switch phones mid-trip.
  • 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

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.

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

By the numbers

Every chart that matters for Holy See.

Docs — 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.

Docs — data dashboard. Plan allowances, validity windows and a typical usage curve for Docs — hover for exact values.
Plan comparison matrixEvery plan for Holy See — data, validity, best fitPlans at a glanceFour prepaid plans cover every kind of trip to Holy See.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.
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.
Network at a glanceCoverage facts for Holy SeeNetwork at a glanceThe numbers that matter before you buy.195destinations liveesimgomobile network data5Gwhere available in Holy Seeesimgomobile 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. Holy See connects to the fastest available local partner network automatically.
Every plan includesNo tiers of basic dignity — these ship with all plansEvery plan includesThe baseline is generous on purpose.Keep your WhatsAppYour existing number keeps working on the data line.5G where availableFastest local partner network, selected automatically.24/7 supportReal humans plus the Tele Agent, around the clock.One-tap top-upMore data in seconds — no new QR code.Hotspot includedShare with your laptop or tablet at no extra cost.6 languagesThe app speaks your language, wherever you're from.
Included with every plan. From 5 GB to Unlimited, the inclusions don't shrink.
Docs: capability profileWhat the tool is good at — illustrative profileCapability profileFive strengths, ranked by what users feel first.Instant resultsno waiting, no signupPrivate by designyour inputs stay in your browserAlways currentreflects live plans and coverageShares wellsend the answer to travel companionsMobile friendlyworks on the phone in your handIllustrative profile based on tool design — not measured telemetry.
Capability profile. Ranked by what travelers notice first, not by marketing priority.
Pro tipsFour habits of the always-connectedPro tipsSmall habits, big difference.1Download offline mapsThey save data and work in dead zones.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. Four habits for smooth trips — pro tips for Docs · Holy See.
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 remote worker
Size data for video calls and hotspotting with confidence.
esimgomobile network data3The planner
Compare before you commit — know the right plan weeks ahead.
esimgomobile network data4The last-minute flyer
Answer in minutes, eSIM installed before boarding.
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.What if data runs out?
80% alert, then one-tap top-up. No bill shock.
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.
How fast is setup?
About two minutes: plan, QR scan, done.
Does hotspot work?
Yes — share your connection with laptop or tablet.
Is it a contract?
No — prepaid. Service simply stops instead of charging extra.
FAQ at a glance. Still curious? The Tele Agent answers anything else instantly.
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 Docs · Holy See ritual, no store visit.
How Docs 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.2Open the toolNo account needed — it loads instantly in your browser.3Get the answerClear result with next steps — save it or act on it.4Enter your detailsTrip, data needs, destination. The tool does the math.
Tool walkthrough. Every tool on esimgomobile follows the same honest pattern: input, math, answer.

Your Holy See 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