Metro Pcs 4 lines for 100 and T-Mobile?

I currently have the 4 lines for 100 with metro pcs but i want to get an iphone 6, and i believe Metro can't run on them if they arent unlocked (?) and i don't want to pay extra cash for it. So, i was wondering if having one iphone run with tmobile but yet still keeping the plan would be possible? (Given that metro runs on tmobile and they both are offering that plan) thanks. Ps I live in Los Angeles. I don't know if ig matters but yeah.

You can't do tht. Just buy an unlocked 6 and use it on metro or you can move your whole family to tmobile.

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