Build Your Own eSIM lets you create a custom multi-country data plan in the Simbye app — choose your countries, GB, and days, and pay only for what you need. Pick 1 to 10 countries from Simbye's 190+ destinations, set 5GB to 50GB of shared data, and a validity from 30 to 365 days. You get one QR code and one eSIM profile that switches networks automatically at every border. It is available exclusively in the Simbye app: App Store or Google Play.
Traveling to several countries and tired of buying a separate eSIM for each one? Build Your Own eSIM is Simbye's custom plan builder. Instead of stacking three or four single-country plans, you create one plan that covers exactly the countries you need — with the data and validity you choose. No unused plans, no juggling multiple QR codes.
This guide explains how Build Your Own eSIM works, who it is for, when it beats a single-country plan, and how to build one step by step in the app.
How Build Your Own eSIM works
Build Your Own eSIM is a custom plan builder inside the Simbye app. It works in three steps:
- Pick your countries. Choose 1 to 10 countries from Simbye's 190+ destinations. Mix continents freely — Italy, Thailand, and the USA can all sit in one plan.
- Set your GB and days. Slide between 5GB and 50GB of data, and set a validity from 30 to 365 days.
- Pay only for what you need. The app calculates your price in real time as you adjust the sliders, then delivers one QR code instantly.
The result is a single eSIM profile that works across all your selected countries. Your phone connects to the local carrier automatically when you cross a border — there is nothing to switch on or off manually. The data is one shared pool, so it does not matter which country you use it in.
Who Build Your Own eSIM is for
Build Your Own eSIM is built for trips that a standard single-country or single-region plan cannot cover neatly. It is the right choice when your route crosses borders or spans more than one region.
Multi-country trips
Visiting Thailand, Vietnam, and Cambodia in three weeks? One custom plan covers all three. No separate eSIMs, no manual switching — your phone connects to each local carrier automatically at the border.
Long-term travel and gap years
A 365-day plan with 50GB across 10 countries suits a gap year or a slow round-the-world trip. One eSIM lasts your entire journey.
Business travel circuits
Regular quarterly trips between Germany, the UK, and France? Build a 90-day plan for your circuit and renew it when it expires. One profile, one bill to track.
Trips that span multiple regions
Standard regional plans cover one region — Europe or Asia, not both. Build Your Own lets you combine countries from different continents in a single plan, so an Italy-plus-Thailand-plus-USA route stays on one eSIM.
Build Your Own vs a single-country eSIM
Build Your Own is not always the cheapest option — and it is not meant to be. For one country in one trip, a standard Simbye plan is usually lower cost. The custom builder earns its place the moment your route covers two or more countries, especially across regions.
| Feature | Build Your Own eSIM | Single-country eSIM |
|---|---|---|
| Countries covered | 1–10 in one plan | 1 per plan |
| Data | 5–50GB, shared pool | Fixed per plan |
| Validity | 30–365 days, you choose | Fixed per plan |
| Border switching | Automatic, one profile | New eSIM per country |
| Best for | Multi-country and multi-region trips | Single-country trips |
| Where to buy | Simbye app only | App or website |
| Lowest price | Better value across 2+ regions | Cheaper for one country |
If every stop on your trip is in the same region, a regional plan may be simpler. For one week in Japan see the Japan eSIM guide, for two weeks across Europe see the Europe plan covering 39 countries, and for a short Thailand trip see the Thailand eSIM guide.
How to build your custom eSIM in the app
Build Your Own eSIM lives inside the Simbye app — it cannot be bought on the website. Here is the full flow from download to travel:
- Download the Simbye app — iPhone (App Store) or Android (Google Play).
- Open "Build Your Own eSIM" on the home screen, or find it under the Custom tab.
- Select your countries. Search or browse the 190+ destinations and tap each country to add it — up to 10.
- Set your data volume. Slide between 5GB and 50GB. This is a shared pool across every country you picked.
- Set your validity period. Choose anywhere from 30 to 365 days.
- Review your price. The app calculates your custom price in real time as you adjust the plan.
- Purchase and get your QR code instantly. Pay in the app and your eSIM profile is issued straight away.
- Install the eSIM. Scan the QR code — see the iPhone install guide or the Samsung install guide.
- Travel. Your eSIM activates automatically when you arrive in any of your selected countries.
What you can customize
| Setting | Range | Details |
|---|---|---|
| Countries | 1–10 | Any combination from 190+ destinations. Mix continents freely |
| Data | 5–50GB | Shared pool across all selected countries |
| Validity | 30–365 days | Plan stays active for the full period |
Real trip examples
Southeast Asia backpacking (3 weeks): Thailand, Vietnam, and Cambodia, 15GB, 30 days. Enough for navigating Bangkok, Grab rides in Hanoi, and Angkor Wat photos.
European business circuit (quarterly): Germany, UK, France, and the Netherlands, 20GB, 90 days. Video calls, email, and presentations across four countries.
Round-the-world gap year: Japan, South Korea, Thailand, Vietnam, Indonesia, Australia, New Zealand, India, Turkey, and Portugal, 50GB, 365 days. One eSIM for an entire year across 10 countries.
Tips for the best custom plan
- List every country first. Even if the last stop is uncertain, add it — coverage you do not use is cheaper than being stranded without it.
- Estimate data realistically. Most travelers use 1–2GB per day, so a three-week trip needs roughly 15–20GB. See the data calculator guide for a closer estimate.
- Pick longer validity. Unused days are cheap insurance against an expired plan mid-trip.
- Check regional plans first. If all your countries sit in one region, a plan like the Europe plan may be simpler.
- Top up anytime. Running low? Add more data in the Simbye app without installing a new eSIM.
Build your eSIM in the Simbye app
Build Your Own eSIM is exclusively available in the Simbye app. Download it, pick your countries, set your GB and days, and your custom plan is ready in minutes:
FAQ
What is Build Your Own eSIM?
It is Simbye's custom plan builder inside the app. You choose 1 to 10 countries, 5GB to 50GB of shared data, and 30 to 365 days of validity, and the app builds one eSIM that covers all of them.
How many countries can I add?
Up to 10 countries from Simbye's 190+ destinations. Your eSIM switches networks automatically at each border, so there is nothing to change manually.
Is the data shared across all countries?
Yes. Your total pool of 5–50GB is shared. Use 3GB in Thailand and 7GB in Japan from the same plan — there are no per-country limits.
Can I add more countries after I buy?
Country selection is fixed at purchase. If you need another country mid-trip, buy a separate single-country eSIM in the app — it works alongside your custom plan.
Is Build Your Own more expensive than separate plans?
For multi-country trips that span two or more regions, Build Your Own usually offers better value than stacking separate plans. For a single-country trip, a standard plan is normally cheaper.
Does hotspot work?
Yes. Hotspot and tethering are included, so you can share the connection with a laptop, tablet, or travel companion.
Where do I find Build Your Own eSIM?
Open the Simbye app and look for "Build Your Own eSIM" or the Custom tab on the home screen. The feature is app-only and is not available on the website.
Can I top up a custom plan?
Yes. If you run low, add more data in the Simbye app without installing a new eSIM.
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