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k2nix

macrumors newbie
Original poster
Currently I'm using unlocked iphone 6s with tmobile unlimited prepaid here in Atlanta and looking to upgrade to XS.

What's the cheapest way to buy a XS today? Trade in my 6s and get $150 off via Apple store? or get contract with service provider?

btw I don't plan on activating two lines (family plan). Just need a single line
 
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