Iphone monthly bill tmobile or verizon?

I'm hoping to get an iphone for christmas.
i heard that the iphone is only $55 a month if you have verizon.
if you have verizon or tmobile, can you please tell me how much your phone bill is monthly?
i'm planning on getting an iphone 4s by the way.

T-Mobile's plans are $50 for the first line, $30 for the second line and $10 for each additional line. That is regardless of what kind of phone you use and includes unlimited talking, texting and data (with 500 mb of high speed data per line).

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