IPhone 4, Switching carriers from Verizon to T-mobile?

I'm debating on getting the Verizon iPhone 4, it'll be free but it doesn't have a Sim card slot. How would I change from Verizon to T-Mobile without a Sim card

You can't. No sim car no t-mobile. T-mobile is only compatible with AT&T iPhone 4 Verizon AT&T and Sprint iPhone 4S and 5.

Can't it is only free with a two year contract. Which means you can only use it with verizion otherwise you hav to pay full prics for te phone. And tmobile sucks don't get it

You can't use an iphone with tmobile no matter what cuz its not compatible

I have an iphone 4 and it is on Verizon and I need to know the information to switch it over to T-Mobile?

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