Can i switch iphone 4s carrier?

I about to buy an iphone for t-mobile at full price and adding it to my family's line but our contract expires in September and we're looking to switch to sprint or Verizon. My question is after the contract expires can i still use my iphone for the other carrier we choose

My iphone broke after iOS 7?

I was browsing youtube when I found that the new iOS 7 had been released (so I thought) so I followed all the steps in the instructional video and it worked all fine. However after doing this I realised I lost all my contacts photos etc. So I went to do a restore through I cloud and when the phone came on its stopped working and I can't get the phone to come back to its usual self as iTunes is saying it can't complete activation. However when I looked into it I realised that IOS 7 had not been released and what I was doing was wrong. Now I'm sitting here with my broken phone feeling completely stupid and i don't know what to do with it and if I tell my mum and dad they will kill me! If someone could tell me that there was some way to restore it to its original software or whatever it would be much appreciated. Or if apple could do anything if I sent it to them it would be much appreciated.

Could not Activate Your iPhone?

I asked AT&T for permission to unlock my phone. They sent an email that they allowed it. I followed the steps, back up on iTunes, and they click restore iPhone. After restoring, I get to the gray iPHONE configure screen, then slide open the iPhone. Next is select a language. Then click next. Then select a region, ad click next. Then select a wi-fi connection and click next. All fine until I click activate iPhone, and continuously get a message that my iPhone could not be activated. This is the only thing my phone can do now, nothing else, there are no apps, contacts, nothing… Just a gray screen that my phone could not be activated. It has a message at the bottom to contact apple support if this continues. I talked to them for over an hour, and they can't do anything. This also happened two weeks ago, same thing when I went to to an update. Apple said they can't so anything about it. I was about to buy a new phone, when someone said let me have it for a couple days. He gave it back the other day, and everything was back to normal except I had no phone service. What's the problem that it can't be activated?

Added (1). I'm the original owner

Why is my iPhone photo library blurry?

Over the last couple of days I've noticed my photos are blurry. I can take a photo fine, and it will be a good quality photo. However, later on I'd go to my photo library and the photo would be blurry. My phone ha randomly blurred a lot of photos which have been taken in the past few months (they weren't like this before). Even photos I took last week which were perfect before, are now blurred and pixelated.
I've also been trying to upload photos onto Facebook which it won't allow me to do, and it also won't allow to send pictures via WhatsApp.
Sometimes when I take a picture it will go a funny beige colour or black out completely.
I tried deleting a lot of stuff from my phone as I didn't have a lot of memory left but it hasn't changed anything.
Also the lens isn't scratched at all.
Does anyone have any ideas? Would really appreciate it!

Would a samsung galaxy ace sim fit in iphone 4s?

I have a two year contract with 3 om Samsung galaxy ace but the phone is awful and I'm going to buy an iphone and was wondering if I would still be able to have the same sim card the same in the iphone 4s

Snapchat verification text not coming through?

Downloaded snapchat on iPhone 5 and trying to get contacts on it but I put my number in and it said it had sent me a text and I haven't received this, I have re installed it and tried a few times but the same thing is happening

What do you do on your iPhone?

Besides the obvious of making calls and texting what apps do you use and what do you use your phone for work or entertainment