Originally Posted by
pseudoswede
You can use the T-Mobile DIGITS app to send/receive calls over wifi while overseas. You just need to make sure that your account is provisioned for DIGITS (which may incur a monthly fee, which I'm sure you can cancel after you get home). I'm on such an old plan that DIGITS was included. The other perk is that you can install DIGITS on your tablet as well as use a web-based version on a laptop, too.
And a warning/FYI... while you can send/receive text messages on the DIGITS app to/from regular phone numbers, you will not receive any two-factor authentication text messages.
After reading about digits online, I was concerned that once you provision your number to digits, it’s there permanently and can’t go back to your SIM card