Can you use an unlocked verizon iphone 4 with at&t?

My friend gave me his Verizon iphone 4 that he unlocked himself. It has no place to insert a sim card. Is there anyway i can switch that phone to my service? I have at&t

Added (1). If you can't switch servers then what's the point of it being unlocked?

Not possible.
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I'm sorry to have to say this, but no. Your iPhone 4 is a CDMA network phone and AT&T uses the GPRS/GSM network. Sorry! Hope it helps!

No. Verizon uses the CDMA cell phone network, whereas AT&T uses GSM. They are completely different networks that can't be used on the same cell phone.

The point of it being unlocked is so that it can either be used with a prepaid GSM carrier, such as AT&T Go, Boost, Straight Talk, etc; or so that it can be used internationally.

No it is not possible.