Can I use my regular number for calls while the travel eSIM handles data?

Yes — that's the usual setup. Keep your home SIM on as your voice line for calls and texts, and set the Airlivo eSIM as the data line for internet. On a dual-SIM phone you choose which line handles data in settings, so your own number stays reachable while the eSIM carries your browsing. Keep in mind that calls on your home line abroad may incur your carrier's roaming charges; the eSIM covers data only.