Iphone 4 verizon to tmobile?

So i have the verizon iphone 4 and my contract ends soon and i want to switch to t mobile when it does so i don't have to pay as much. But the iphone 4 verizon doesn't have a SIM card slot does it? So i was wondering if there was any way i could take it apart and see if there's one or i could do the trade in and get an iPhone 5 with tmobile. Opinions or any knowledge on the SIM slot?

And wtf is that?

There's no simple card slot, sorry. You can trade it in for the iPhone 5 on T Mobile though.

No, the iPhone 4 from Verizon is a CDMA only phone
T-Mobile is a GSM service, these are NOT compatible
you can see if T-Mobile will give you some trade-in discount, thats the only option.