I am thinking about buying the T-mobile iPhone 6 unlocked, but i will be living in Spain next summer and I would like to know if it will work there with a Movistar sim card.
Tmobile doesn't sell their iPhone unlocked so you would need
to buy one from Apple and check the bands to see if it's compatible with
iPhone 6 - Buy iPhone 6 and iPhone 6 Plus - Apple Store (U.S.)
If you plan on using T-Mobile between now and then, it would work. You need to be on a postpaid plan for 40 days and the phone balance paid off before they'll do the unlock. Expect to be backordered if you order the phone now.
Retrieving data ...