The short answer
An eSIM is a digital SIM that you install on your phone instead of a plastic card. For a trip, it lets you buy data for the country you are visiting, switch it on when you land, and keep your Indian number for calls and banking codes. Check that your phone supports it and is unlocked, install the profile on Wi-Fi before you fly, and compare data allowance, coverage and hotspot rules rather than price alone.
Key terms in plain English
- eSIM: a SIM built into the phone, installed by scanning a code or following a link.
- Unlocked phone: a phone that works with other operators’ plans.
- Roaming: using your home operator’s plan abroad, usually charged by the operator.
- Hotspot: sharing your phone’s data with another device. Some plans limit it.
eSIM or roaming?
- A travel eSIM is a data plan for the country or region, often cheaper for data than roaming. It does not usually include your Indian number.
- Roaming keeps your number and plan, and charges by your operator’s rules. Read what it charges before you go.
- Both. Many travellers keep the Indian SIM on for banking codes and use an eSIM for data.
Before you go
- Check your phone supports eSIM and is unlocked.
- Choose a plan that covers every country on your trip.
- Install the eSIM on Wi-Fi before you fly, and keep it off until you land.
- Save the provider’s support details.
- Keep your Indian number reachable for bank codes, or check how your bank sends them.
Checklist
- To do: Check the phone supports eSIM and is unlocked
- To do: Check coverage for every country on the trip
- To do: Compare data allowance and hotspot rules
- To do: Install the eSIM before you leave, on Wi-Fi
- To do: Keep your Indian number active for banking codes
- To do: Save the provider’s support details offline
- To do: Cancel or let the plan lapse after the trip
Common mistakes
- Buying a plan the phone cannot use. Check support first.
- Installing at the airport. Do it on Wi-Fi at home.
- Forgetting the codes. A switched-off Indian SIM can block bank messages.
- Ignoring the fine print. Some plans limit hotspot use or speeds.
- Leaving roaming on. Switch data roaming off if you use an eSIM.
Things that change
Plans, coverage and phone settings change. Check the provider’s current page before you buy, and your phone’s settings before you fly.
Verify before you act
India’s telecom regulator, the Telecom Regulatory Authority of India, publishes official information for consumers. For the country you are visiting, check its regulator or your provider’s page for what applies.