I am traveling to Italy for two weeks. What coverage do I have under my Magenta 55+ plan?

I want to say all Magenta plans include Simple Global. Unlimited text and data at up to 256Kbps speeds in 215+ countries and destinations; flat rate calling at .25 per minute in 215+ countries and destinations. However, that might vary based on specific Magenta plan - you can verify by logging into you account and going to: https://my.t-mobile.com/account/plan-details

Italy is one of the countries for my Magenta Max plan, but you can search countries at:

https://www.t-mobile.com/cell-phone-plans/international-roaming-plans

Also see:

https://www.t-mobile.com/support/coverage/international-roaming-services