How much does it cost for 4 lines on T mobile?

One more thing can you buy an iPhone 4s and use T mobile network

Added (1). I mean unlocked iPhone. Can you use the family plan for 4 unlocked iPhone.

Added (2). Can you use the family plan from t mobile for your own phone not from t mobile an unlocked one.

Tmobile does not sell iPhones for all I know. I'm not sure about the plans but they have it in the Tmobile site.

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