Can i put an ATT SIM card in verizon phone?

No, Verizon phones don't use SIM cards.

Also AT&T uses GSM, where Verizon uses CDMA, so each phone is programmed to look for the different technologies. It wouldn't work.

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You cannot. Because Verizon doesn't use Sim cards, they are what you call CDMA phones. The only phone for Verizon that uses a Sim Card is the blackberry storm. Basically, I would say Verizon and AT&T are pretty much similar price wise. All the phone companies are expensive, so really, it doesn't matter to me. Hope I helped :]

I actually ordered a Samsung S5 from the Groupon app. I took it to an AT&T store and it first they said they couldn't do a damn thing... But then the lady went into the settings and typed in AT&T's VPN. I did, however, end up sending it back and get an actual AT&T Samsung S5 because every time it showed the Verizon opening display and had too many Verizon apps on it. I'm already annoyed with all the built-in AT&T apps, I damn sure don't want to be bothered by Verizon's apps..blah. But moral of the story is, it does work on Verizon if you popping. #youdowhatyouwantwhenyoupopping

nope definitely not. verizon uses cdma technology, in other words no sim card. you could use any phone from att or tmobile but you can't use verizon or sprint. unless you get the world phone from verizn but thats the only one that has the gsm like att.

Verizon phones do not use sim cards

At&t Sims Card

have Verizon Motorola smart phone currently have prepaid card in it, wanted to go to ATT service and port a number from a expired ATT flip phone.was currently on someone else plan and it expired in apr 16 2015. att told me it was locked, and it was not she tried her phone thingee and she told me it was locked. It was not went to Verizon to confirm it was not, so AFTER ALL THIS VERBAGE I WANT TO USE MY VERIZON PHONE and do a att prepaid plan. Any help would be appreciated

unfortunatly, no, but they can transfer the data, verizon uses a data transfer module, not sim cards, so the data is stored in a base unit, i know i had to go through the same thing with t mobile when i transferred to verizon. They say its easy for them to do, hopefully yours will be as easy as mine, if you decide to switch

I have an iphone and i wanted it so i could flash it to cricket later to find out that AT&T uses GSM and cricket uses the same as Verizon wich is CDMA. these are too different networks (Technologies) It wont work!