The eSIM for Portugal provides you with access to 5 GB to Unlimited Data (depending on the plan chosen), without physically changing the SIM card in your phone.
The eSIM plan is valid for 30 days and also provides you with Free Incoming calls (with UK based mobile number) in addition to the data.
All you need is an eSIM compatible mobile handset (iOS, android or otherwise).
In order to purchase the eSIM, just complete the transaction here and an eSIM QR code will be emailed to you in the next 30 minutes with instructions to install on your phone.
Once installed, you can start using data on the eSIM in Portugal immediately. The validity of the eSIM shall start from the day when you start using it in Portugal.