Your new phone has no SIM tray, or only one.
The shop says "just use eSIM", as if that explains anything.
It is simpler than it sounds.
But there are two moments where people get caught out.
What is an eSIM?
It is a SIM card built into the phone.
Instead of inserting a plastic card, your network sends the SIM details to the phone.
Your number, plan and balance stay exactly the same.
Can every phone use one?
No.
Most recent iPhones and many newer Android phones support eSIM.
Check your phone's settings, under Mobile network or SIM, for an option to add an eSIM.
Your network's website also lists supported phones.
How do I switch my number to eSIM?
Jio, Airtel and Vi all offer eSIM, and each has its own steps.
Usually you start the request in the network's official app, by SMS, or at a store.
There is an identity check, and then you scan a QR code or the phone sets it up automatically.
Your old physical SIM stops working once the eSIM is active.
Follow only the steps on your network's official app or website.
What happens when I change phones?
This is the first catch.
An eSIM does not simply move by taking out a card.
On many phones you can transfer it during setup of the new phone.
Otherwise, ask your network to issue it again for the new phone.
Do this before you wipe or sell the old phone.
What is the scam to watch for?
This is the second catch.
A caller claims to be from your network and offers to "upgrade" you to eSIM.
They ask you to forward an SMS or share a code.
That gives them a new SIM for your number, and with it your OTPs.
Never start an eSIM change because someone called you.
Things to Remember
- An eSIM keeps your same number and plan.
- Check your phone supports eSIM before you request one.
- Use only your network's official app, website or store.
- Move the eSIM before you wipe or sell the old phone.
- Never forward an SMS or code for a caller offering an eSIM.