How to unlock an iphone 4 onto tmobile without having a sim card?

I just got an iphone 4 from my friend and it was previously on verison wireless and it does not have a sim card slot and i wanted to activate it to use on tmobile.anybody know how?

You Can't use Verizon Wireless iPhone 4 on to T-Mobile because Verizon iPhone 4 is CDMA handset and T-Mobile only works with GSM handsets.

You can't.

Can't if you want T-Mobile it's GSM you have to have a phone that use GSM.