Iphone does not have a sim card slot?

I bought an I phone 4 by Verizon. I have T Mobile so my friend would have been able to unlock it and what not. The problem is, it does NOT have a sim card slot AT ALL. Is there any way i can use the phone without selling it?
*Maybe go by the Verizon or T Mobile store?
*seriously I need help with this. Because I really want to use it and if I can't at all please help me. Or let me know.

It's a Verizon iphone (CDMA). You can't use it on AT&T or Tmobile.

Craiglists or PennySaver and trade someone for a t-mobile iPhone so you can use it.

Or you can "Jail-Brake" the iphone and it will receive service from multiple service towers.
Here are links for How to Jailbrake Iphones.

http://www.iphonehacks.com/jailbreak
http://www.howstuffworks.com/how-to-tech/how-to-jailbreak-iphone.htm

Yes, iphones do not have sim card slots.
If you want a lot of space on your phone without spending a lot of money I would get a android phone because you can put up to a 64 gb micro sd card inside it

No. The iPhone 4 was either GSM or CDMA. Verizon is a CDMA network so their iPhone 4s did not nor did they need microSIM slots.AT&T on the other hand is a GSM network so their iPhone 4s did have them.

Nothing you could do in this regard. You will have to get a GSM model.

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