Can a travel eSIM replace your regular phone plan?
Not quite: travel eSIMs are data-only, with no phone number for calls, texts, or the verification codes your bank sends. They are built to sit alongside your home SIM, not replace it. What you can do is shrink your home plan to a minimal bundle and let cheap eSIM data do the heavy lifting.
The tempting math ("why pay for my home plan when eSIM data is this cheap?") runs into one wall: the phone number. Your number is your identity for banks, government services, WhatsApp registration, and every two-factor text. Travel eSIMs deliberately skip numbers; that is why they are cheap and instant. Give up your home SIM entirely and you lose the anchor half the internet uses to recognize you.
The smart version of the idea keeps the number and cuts the cost: downgrade your home plan to the smallest bundle that keeps the number alive, leave it as your primary SIM for calls and texts, and run a data eSIM as the workhorse. Some people do this even at home where unusual data pricing makes it worthwhile, and services like Firsty (with its free, ad-supported slow tier) push in that direction.
For most people, though, this is a traveler's optimization, not a home strategy: at home, a normal bundle from a budget carrier is simpler and usually cheaper than juggling top-ups. The dual-SIM future is already here for trips; for daily life, one good cheap plan still wins on peace of mind.