Can I use an unlocked iPhone on any network?

Question

I recently bought an iPhone and joined the AT&T network.  As much as I loved the iPhone, I had to give it back to get away from AT&T: Their customer service was horrible (rude, misinforming, and trying to say my bill was $800 when it turned out -- after appealing to half a dozen managers -- that it was under $100).
So, what happens if I buy an "unlocked" iPhone?  Can I just take it into my nearest Verizon Wireless store (my new cell-phone carrier) and tell them to activate it on their network? 
Other than the voided Apple warranty, are their any other problems I'll be facing?

Anonymous · Accepted Answer

No because Verizon wireless uses the CDMA network. And iPhones only work for GSM networks.

catylina_youkai · Answer

The iphone does not work on verizon, at all unlocked or not. an unlocked iphone would only work with other carriers that have simcards meaning they use a gsm network. 
Verizon uses CDMA and the network is literally not compatible with the iphone.

evilattorney · Answer

An unlocked iPhone cannot be used with either Verizon or Sprint.  It can be used with T-Mobile and some regional GSM carriers.  

T-Mobile does not support 3g for the iPhone so it's rather slow.  Visual voicemail is also not supported.

Anonymous · Answer

No, sprint community won't take unlocked telephone, comparable with verizon. in uncomplicated terms different community that artwork different than ATT interior the u.s. is T-cellular. the recent 3G Iphone is impossible to artwork with Tmobile with the aid of broadband distinction.

TMNT :] [RVD] · Answer

Edit: Sorry, nvm you can't. I forgot Verizon doesn't use sim cards.

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Can I use an unlocked iPhone on any network?

5 Answers