Do I need to jailbreak my iphone 4s to use it with another carrier?

I recently bought a Verizon iphone 4s from someone and I want to use it with AT&T. I know I need a smaller sim card but do I have to jailbreak it and unlock it? If so, can you tell me somewhere that isn't scam that could do it for a low price or if I can do it myself?

Can i type Russian on iPhone?

Is it possible for the iPhone to be able to type Russian? If so, how? I know it you press letters, other letters like German and some accepted letters come up. So I can type in German. I'm just wondering about other letters

Why won't my iPhone send or receive pictures?

I have the I phone 4 and iOS 6 but my phone for some reason won't let me send or receive pictures through texts it hasn't let me for a while now (6-7 months) but now it won't even let me receive pictures what can I do to fix this?

Will restoring my Iphone to facorty settings erase my data?

I have upgraded my iphone 4s to the new iOS, and then a few days later, tried connecting my device to my PC ( i have the new itunes).It, however, tells me that it can't connect to my iphone and that i should go to 'Preference' and select to 'restore to factory' settings. Will this erase my data and 'degrade' my phone to the previous iOS?

Imessage over Wi-Fi sometimes not working?

My iphone won't send an imessage to anyones iphone all of a sudden. The Wi-Fi is connected. The sending bar will load then it just stops near the end and it says failed. Also i won't receive any messages and all of a sudden when it does work ill get a bunch of messages all at once. THis has been happening for over a month now! What's going on?

Should I upgrade my iPhone 4S to the iPhone 5? - 1

I got the iPhone 4S last year for Christmas. My moms phone is due for an upgrade, and I'd be able to take her phone if she'd upgrade to he iPhone 5, and I'd just give her my iPhone 4S. What should I do?