Short answer: install your travel eSIM at home, on Wi-Fi, a day or two before you fly. Then keep it switched off until you land. Turn it on at the airport and your plan is ready to use. Installing is the step that needs internet, so doing it at home avoids stress on arrival.
You have bought a travel eSIM. Now you are wondering when to set it up. Do it now, at the gate in Delhi or Mumbai, or only after you land?
An eSIM is a SIM built into your phone, so there is no small plastic card to swap. You add it by scanning a QR code or tapping a link. This guide explains the best timing, and when your plan's days start counting.
Should I install my eSIM at home or after landing?
Install it at home. The install step downloads a small file to your phone, so it needs internet. At home you have your own Wi-Fi, a charged phone and no rush.
After landing, you may have no internet at all. Airport Wi-Fi can be slow, or ask for a local phone number to log in. A tired traveller in an arrivals hall is the worst place to scan a QR code.
Installing is not the same as turning on. You can add the eSIM at home and leave it switched off. You switch it on only when you land.
Home or after landing: a quick comparison
| Question | Install at home | Install after landing |
|---|---|---|
| Internet needed to install | Your home Wi-Fi | Airport Wi-Fi, which may fail |
| Stress level | Low | Higher |
| Help if something goes wrong | Time to fix it or ask support | You are stuck with no internet |
| Plan days used up early | Depends on the plan's start rule | Depends on the plan's start rule |
| Best for | Almost everyone | Only if you ran out of time |
When does my eSIM plan start counting days?
This is the part that confuses people most. Installing and starting are two different things. Plans usually begin their days in one of three ways:
- When you first connect abroad. The days start only when your phone joins a network in your destination.
- When you install. The days start the moment the eSIM is added to your phone.
- On a date you choose. You pick the first day when you buy.
Plans differ, so always read the start rule on your plan page or order email before you fly. Do not guess. If days start at install, install close to your travel date, not weeks before.
You can browse the start rules on our eSIM plans page, or check the frequently asked questions.
How long before my flight should I install it?
One or two days before you fly is a good rule. That gives you time to fix a problem. It also keeps the eSIM fresh in your mind and in your phone settings.
Do not wait until you reach the airport in Bengaluru or Hyderabad. Queues, security checks and boarding calls leave little room for settings menus.
If your plan starts at install, install on the day you leave or on the day you land, using hotel or airport Wi-Fi. Check this rule first.
How to install your eSIM at home, step by step
First, check that your phone works with eSIM. Look at our list of eSIM compatible devices. Then follow these steps. Exact menu names change by phone, so our eSIM installation guide has the details for each model.
- Connect your phone to your home Wi-Fi.
- Open the order email from Olysim and find the QR code.
- Open the SIM or mobile data settings on your phone.
- Choose the option to add an eSIM.
- Scan the QR code. If you are using one phone, take a screenshot and use that, or use the install link or the manual details in the email.
- Give the eSIM a clear name, such as 'Travel'.
- Leave your Indian SIM as your main line.
- Switch the travel eSIM off until you land, unless your plan page tells you otherwise.
A QR code can usually be scanned only once. Do not delete the eSIM after installing. If you do, you may not be able to add it again.
What do I do when I land?
Keep this short list ready before the flight. It takes about two minutes.
- Switch off airplane mode once you are on the ground.
- Open your SIM settings and turn the travel eSIM on.
- Set mobile data to use the travel eSIM.
- Turn on data roaming for the travel eSIM. Data roaming lets your phone use a network in another country.
- Turn data roaming off for your Indian SIM, so you do not pay roaming charges.
- Wait a minute for the signal bars to appear.
Your Indian SIM can stay on for calls and SMS. That way bank OTPs still reach you. If something fails, see eSIM not working after landing abroad: step-by-step fixes.
Can I install an eSIM without deleting my Indian SIM?
Yes. Most eSIM phones hold your Indian SIM and a travel eSIM together. You do not need to remove anything. Our guide on setting up an eSIM without deleting your old one explains it fully.
What if I forgot to install it before flying?
Do not panic. You can still install it after you land. You just need some internet first.
- Look for free airport Wi-Fi in the arrivals hall.
- If the Wi-Fi asks for a local number, try a cafe or your hotel Wi-Fi instead.
- Keep your order email and QR code saved on the phone, not only online.
- Install it right where you have the best Wi-Fi signal.
This is also why it helps to read how much data you need before you buy. See how much data you actually need for a week abroad.
What if my phone has no eSIM support?
Some older and budget phones cannot use an eSIM. For these, Olysim also offers a physical travel SIM. This is a small plastic card that goes into your phone's SIM tray. You may need to swap your Indian SIM out to fit it, so plan how you will receive bank OTPs before you fly.
Final checklist before you fly
- Confirm your phone works with eSIM.
- Read the plan's start rule.
- Install the eSIM at home on Wi-Fi.
- Save a screenshot of your QR code and setup email.
- Keep the eSIM switched off until you land.
- Keep your Indian SIM on for OTPs, with data roaming off.
The short version
Install your travel eSIM at home, on Wi-Fi, a day or two before you fly. Switch it on when you land. Check your plan's start rule so no days are wasted. When you are ready to choose a plan, see all Olysim eSIM plans. If you need help, call +91 8899864933.
