Changing to iphone 4 from HTC Incredible 2

[amyloo]

My son wants to start using an iphone 4 instead of his HTC.  Can he use the same sim card?

[soupcannon]

There is no sim card in the 4 I don't know about the 4s

[Ann154]

Neither one uses the SIM card to connect to the Verizon Wireless network as well.

[commonsense101]

If you ment the SD memory card, the iphone doesn't have that either

he would have to transfer all his info to a computer and sync it with itunes to get to his iphone

[Wildman]

The SIM is for the 4G signal  or International, the iPhone 4gs SIM is for International use only, also remember that the iPhonr does not even have 4G.

[JonDoh]

Wildman, the AT&T version of the iPhone 4GS does have 4G, but the Verizon and Sprint versions do not.  All versions of the 4GS now have dual radios and if you have the Verizon or Sprint version you can have a sim card added for travel overseas.

But back to the op's question.  If your son has an iPhone 4G with a sim card then that is an AT&T iPhone and it won't work on Verizon's network.  If he does decide to get another phone with Verizon the rep can transfer his contacts to the new phone. 

[soupcannon]

The AT&T is just renamed 4g it's no faster

[Wildman]

None of the iphones have 4G, apple played on the name but the iphone 4 or 4S is the fourth generation device but does not have a 4G radio, the iPhone 5 is rumored to possibly have it but as of now no iphone supports 4G..

Now the part about the device that the OP have may be a ATT version may be the case or they are simply talking about the sim for the international signal that av Verizon  version supports...  I think it is getting crazy with Apple releasing the same devices on different carriers that support different features.

[Ann154]

The ATT iphone 4S has HSPA+ 14 which ATT has "coined" as "4G" with enhanced backhaul. HSPA+ is just an enhanced version of 3G.

[AZSALUKI]

you all just gave me a headache!!!