Yes, and that is the normal arrangement. The travel eSIM is a second line: it carries data while your own line keeps your number for calls and texts.
You choose which line does what in your phone’s settings — mobile data on the travel line, calls on your own.
A phone with one physical SIM slot and eSIM support handles this fine. Nothing has to come out.
The travel eSIM. On an iPhone: Settings → Cellular → Cellular Data → choose the travel line. On Android the same choice is under the SIMs screen, as the mobile data preference.
This is the setting that stops your home carrier billing you for roaming. Everything else can be right and this one wrong, and you will still get a bill.
Leave your home line switched on if you want calls and texts on your own number. It should not be the one carrying data.
Yes. The travel eSIM is a second line carrying data only, so your own number stays on your own SIM and keeps working for calls and texts.
Those calls and texts are charged by your own carrier at their usual roaming rates. We do not change that and cannot see it.
To stop your carrier also charging you for roaming data, switch mobile data over to the travel line and turn data roaming off on your home line.
Look for the option to add one. iPhone: Settings → Mobile Service (Cellular on some versions) → Add eSIM. Android: Settings → Network & internet → SIMs → Add eSIM. If that option exists, the phone supports eSIM.
Two things have to be true, and this is only the first. The phone also has to be unlocked, which no phone will tell you from its settings.
Check both before you buy. An eSIM installs once, and a phone that cannot take it has already spent your purchase.
Ask us — a person answers, usually within one working day.