Travel eSIMs are data plans. Read that sentence again, because once it clicks, every other question answers itself. Here is exactly what happens to your calls, texts and apps when you travel with one.
The setup that makes it all work
Your phone holds two SIMs at once while you travel: your home SIM stays in (with data roaming OFF so it costs nothing) and the travel eSIM carries all your internet. That combination gives you the best of both worlds below.
WhatsApp, iMessage, FaceTime, Telegram: everything works, unchanged
These apps run on internet, not on phone-network calling, and they are tied to your account, not to whichever SIM provides the connection. Your WhatsApp keeps your normal number, your iMessage stays blue, and video calls home work beautifully on the eSIM's data. For most travelers this covers 95% of communication, and it is exactly how locals communicate in most of the world too.
Incoming calls and SMS to your normal number
Because your home SIM is still in the phone, calls and texts to your regular number still reach you. Receiving SMS while roaming is free with almost every carrier worldwide, which matters for one thing above all:
Bank and verification codes keep arriving. Your bank sends its code to your home number, your home SIM receives it, you approve the payment. This is a genuine advantage of the eSIM setup over pulling your SIM out for a local one.
Answering a voice call while abroad uses your home carrier's roaming rates, so let non-urgent calls go to voicemail and reply over WhatsApp. Making regular calls works the same way: possible, but roaming rates apply, so use an internet call instead whenever you can.
What a travel eSIM does not give you
- A local phone number: data eSIMs generally come without one. If someone at the destination needs to call you, use an app number or have them reach you on WhatsApp.
- Free regular calling: dialing a restaurant the old-fashioned way still goes through your home SIM at roaming rates. Short calls cost little; just know it's happening.
The practical recipe
- Home SIM: ON, data roaming OFF. Receives texts and urgent calls.
- Travel eSIM: ON, set as the data line. Carries everything else.
- Calls home: WhatsApp, FaceTime or Telegram over data.
- Local restaurants and taxis: book online, or accept a brief roaming-rate call when there's no other way.
Keep your number, skip the roaming bill
A data eSIM plus your home SIM covers everything, delivered by email in minutes.
Browse eSIM plans →Frequently asked questions
Will my WhatsApp number change when I use a travel eSIM?
No. WhatsApp stays on the number it was registered with, regardless of which SIM provides the internet. Nothing to reconfigure.
Can I receive bank verification codes abroad?
Yes, they arrive by SMS to your home SIM, which stays active in the phone. Receiving SMS abroad is free with almost all carriers.
Do I get a phone number with a Telisco eSIM?
Our travel eSIMs are data-only, so no separate number is included. Your existing number remains reachable the whole time via your home SIM.
What happens if someone calls me while I'm abroad?
The call rings through your home SIM. Answering uses your home carrier's roaming rate, so either accept it (short calls cost little with most carriers) or let it go to voicemail and call back over the internet.
Can I make emergency calls?
Yes. Emergency numbers like 112 and 911 work from any phone with network signal, regardless of SIM or plan.