1. Select Roamless eSIM for Mobile Data
Go to Device Settings > Connections > SIM Manager
Select the Roamless eSIM for Data
Note: Depending on device manufacturer, the settings/menus could be slightly different. If you do not see separate options to select for Calls, SMS and Data, and can only select "Primary SIM", please select Roamless eSIM for "Primary" when you want to use it for data.
2. Turn Data Roaming ON for Roamless eSIM
Go to Device Settings > Connections > Mobile Networks
Turn ON 'Data Roaming' for your device
(Roamless eSIM is a global eSIM, so it needs data roaming to be turned ON)
Note: If your Android device (e.g., Pixel devices) allows separate data roaming settings for your different SIMs/eSIMs, please turn on data roaming only for the Roamless eSIM
3. Check APN Settings
APN gets auto-configured upon eSIM installation, however if you don't have data connectivity with your eSIM (even with the above settings in place), it's recommended to check APNs and if needed manually adding/configuring them.
Go to Device Settings -> Mobile Networks -> Access Point Names
Click on Roamless eSIM at the bottom of the screen
If the page that comes up is empty, click on + on the right corner > enter the below details into their respective fields
Once done, click ... (three dots) on the upper right corner > Save
Note: Only enter the details below, you do not need to edit/change anything else
Name: RoamlessAPN: roamless
APN type: default,suplAPN protocol: IPv4/IPv6
APN roaming protocol: IPv4
Bearer: Unspecified
When you're done using your Roamless eSIM and/or are back home
Go to Device Settings -> Connections -> Mobile Networks
Turn OFF 'Data Roaming'
Go to Device Settings -> Connections -> SIM Manager
Select your regular SIM for mobile data again
Alternatively: You can turn off the Roamless eSIM on your device until you need it again.
Reminders:
Your device may have slightly different settings screens compared to those in the instructions above. However, the general principle is always the same. You select your Roamless eSIM for data connectivity on your device (and turn on data roaming for the Roamless eSIM) when you need it. And you select your regular SIM when you're back home.
Roamless eSIM is data-only. So if you have your Calls and Messages set to your regular SIM, your operator may still charge you (for calls & SMS abroad) if you make/take calls on your regular phone number, or send SMS while you're traveling abroad. Receiving SMS is always free.
If you want to avoid roaming charges on calls and SMS as well, you can turn OFF your regular SIM when traveling abroad. But please note: with your Primary SIM off, you won't be able to receive calls or SMS.