T-mobile has awesome phone plans for people living in America to get free international roaming in over 140 countries. For most people, all they’d have to do is flip the switch on their phones that enable international roaming. For a minority of people, there are a few more settings to mess with. In the past year, I’ve had two issues that resulted in me losing my data connection outside of USA and I’m documenting some things below to try since it worked for me – maybe it’ll help some people out.
Check that international data roaming is enabled
Try a different APN
I’m using “T-Mobile US LTE 260”. Not sure if changing this requires a phone restart. I restarted my phone anyway.
Set the APN protocol and APN roaming protocol to IPv4/IPv6
Just tap on the APN you want to change. Hitting the 3 dots will show the save button. Not sure if changing this requires a phone restart. I restarted my phone anyway.