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Yes. You will be. It will be same as taking a T-Mobile SIM in International Roaming. That is my understanding. Still tagging tmo_chris to validate my comment.
It is supposed to work the same as taking you sim overseas. Keep in mind some countries have weird toll rules which you could pay some serious dough especially when making international calls over wifi.
Thank you for the answer, my first time traveling internationally with T-mobile.
I just got back from a month traveling through Switzerland. I have an iPhone 7 with my T-Mobile "ONE All in" plan.
Yes, you get charged $0.20/minute send or receiving calls. But you can avoid this charges by using FaceTime (Audio) or Whatsapp (calling) for free since Data is included. The reception and sound quality was supprisingly good considering T-Mobile only offers up to 256 Kbps bandwidth. That brings me to the next point... Use WIFI where every you can to keep your phone up to date since 256 Kbps is sooooo slow.
And "No" T-Mobile doesn't offer any add-ons to increase the bandwidth.
Another quick tip not related to T-Mobile... If you use Public Transportation (which is awesome in Switzerland), get the SBB App and sign up for an account. That way you can purchase the Tickets directly through the App and sometimes even can find "supersaver" deals if you purchsed specific tickets ahead of time.
Have fun in Switzerland!