Four steps, about a minute, done on your sofa over home Wi-Fi. Installing only loads the profile onto the phone. You leave the line switched off and turn it on when you want the plan to run.
It carries your QR code, your ICCID and this same guide. Keep it, it is your receipt.
Settings, Mobile Service, Add eSIM, then scan the QR code. iPhone and Android both do this in under a minute. Label the line Singapore so you can find it later.
Loading the profile onto the phone is not the same as switching it on. Leave this line off until the day you want the plan to run.
Switch off flight mode. The eSIM finds a Singapore network and activates itself. Your days are counted as calendar days in Singapore, and a part day counts as a whole one, so switch the line on in the morning of the first day you need it.
You do not tap anything at Suvarnabhumi. Switch off flight mode and the ESIM registers on a Bangkok network. One thing worth knowing before you pick a length: the days on a package are calendar days in Bangkok, not 24 hour blocks, so a line switched on at 11pm has used up that whole day. Switch it on in the morning of the first day you need it.
Check the Bangkok line is switched on, that data roaming is on for that line, and that it is set as the mobile data line. Those three toggles are almost always the whole problem.
Enter the details by hand instead. The email carries the activation code and the ICCID, and every phone has a manual entry option under Add eSIM.
Open live chat in the app with your order ID, the ICCID from My eSIMs, your phone model and a screenshot. A replacement is free, for the whole trip, not only on day one.
A travel eSIM is data only and runs as a second line, so calls and your bank OTP codes still arrive on your normal number. Do not delete anything.
Most plans allow tethering, but not all. If you are going to work off a laptop between side events, check the package details before you buy.
Leave your email and it arrives in one message.
An ESIM has to be installed over Wi-Fi before you fly, and the one place without Wi-Fi is the airport you land at. Two minutes now saves that.
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