Dual SIM for Travel: Keep Your Number and Add an eSIM (Setup Guide)
Dual SIM lets your phone run your home number and a travel eSIM at once. Here is exactly how to set it up so calls and codes still reach you while the eSIM carries cheap data.
Dual SIM is the feature that makes travel eSIMs so painless: your phone runs two lines at once, so you keep your home number for calls and codes while a travel eSIM carries your data cheaply. Here is exactly how to set it up on iPhone and Android — and the settings that actually matter.
What dual SIM means for travel
Almost every eSIM-capable phone is dual SIM: one physical SIM (or a second eSIM) plus your travel eSIM, both active. That lets you:
- Keep your home number live for calls, texts and — crucially — bank OTP codes.
- Use the travel eSIM for all data at local prices.
- Avoid a roaming bill by keeping your home line's data roaming off.
The setup, step by step
First, install your travel eSIM — the install guide walks through it. Then:
On iPhone (Settings → Cellular):
- Keep your home line ON (for calls/texts).
- Set Cellular Data to your travel eSIM.
- Turn Data Roaming ON for the travel eSIM (this is how it reaches the local network — it costs nothing extra).
- Turn Data Roaming OFF for your home line so it cannot rack up charges.
- Optional: turn off "Allow Cellular Data Switching" so your data never falls back to the pricey home line.
On Android (Settings → Network & internet → SIMs):
- Keep your home SIM enabled.
- Set Mobile data to the travel eSIM.
- Enable Roaming on the travel eSIM line; disable it on your home line.
The one settings combo that matters most
Get these two right and everything works:
- Home line: data roaming OFF (still receives calls/texts on your number).
- Travel eSIM: data roaming ON and set as the data line.
That keeps your number reachable, your data cheap, and your bill flat. More on staying reachable in our keep-your-number guide.
Bonus: Wi-Fi calling
Enable Wi-Fi calling on your home line and calls/texts on your normal number work over any connection — often billed as if you were home. Combined with the eSIM for data, you rarely need a voice plan abroad.
The bottom line
Dual SIM is what lets a travel eSIM add cheap data without touching your identity. Keep your home line on with roaming off, set the eSIM as your data line with roaming on, and you are connected on your own number for a flat local price. Browse plans for 190+ destinations and set it up before you fly.
Remember the combo: home line roaming OFF, eSIM line roaming ON. That single pairing is the whole trick.