Can an iPhone 5 under AT&T 's network be switched to Verizon's network?

Can an iPhone 5 under AT&T 's network be switched to Verizon's network?

No. The two companies use completely different network technologies. Their hardware is not compatible.

It maybe possible though I think unlikely. As the other answerer said yes AT&T & Verizon use 2 different technologies but the iPhone 5 like the 4S before it is a worldphone as well, being able to be used on both.

Again though I'm not sure if either carrier would allow it & how it would be done.