Iphone 5. I can't end a call sometimes?

I did a master reset and i'm still having this problem? Basically when i'm in a call and I try to end it its just frozen its like it doesn't detect my finger hitting end. Should I bring it into AT&T?

My shins still hurt when I walk?

I've been going to the gym or walking my neighborhood since May. I walk on the treadmill at a speed of 3.8mph and according to my iphone app I walk about the same speed on the street. I do this 3-5 days a week, I'm always on my feet and I teach ice skating so I'm in skates 5 days a week. My shins hurt! What do I have to do to get them adjusted to walking? I'm in good running shoes, relatively new. Don't suggest running, it's not something I have any desire to do

Do prepaid SIM cards still exist in London and which Telco is best to purchase from?

I'm from out of town and going to London for a couple of days before moving on to the rest of Europe. Staying in the Kensington area. I use an iPhone but I was thinking of using an old Nokia and purchasing a prepaid SIM card while there. If that's possible. Do they have those over there? Just for temporary usage? Also which telco would be the best to purchase that from and whereabouts?

Wanting to buy the Iphone 5?

I have sprint service and have the iphone 4.im not eligible for an upgrade til may 1st 2014. But the iphone 5 is at walmart for 98$ with a 2year contract with sprint verizon or at&t. Can I buy that for my service at that price and use it? Or will it cost me more because I don't have an upgrade?

Why won't this battery charge an Iphone?

I have an Iphone 4 and I'm trying to make a portable solar charger. I just got a 4.8 volt 1800mah rechargeable battery. When I connected the usb to an old Ipod I have the battery was able to charge to Ipod. But, when I connected to to my Iphone nothing happens. All I did was connect the battery to a usb female which connected to the ipod. Why won't it charge my phone?

Added (1). To sultan: I'm not sure what you mean by charge the usb. Right now my set up is Ipod to its normal white usb wire to a female input that connects to the plus and minus of my battery. Only the ipod works in this set up but now the iphone.

ALL JAILBREAKERS. I need your opinion?

So i've been looking at iOS 7 and noticed that they've added features from the jailbreak community.i've been with iphone for so long that i've always thought the only iphone is the jailbroken one but i might reconsider that. So does anyone think its worth upgrading and losing their jailbreak or should we wait till ios 7 is publicly jailbroken?

Where can I buy broken iPhones?

I have set up a business selling, repairing and customising iPhones and I need a reliable supplier for broken iPhones. I've found that all the broken iPhones on eBay are over priced and impossible to repair. Can anyone help me out?

New iPhone upgrade problems?

I used to have a Blackberry Bold 9900. I had this on a contract for 2 years since October 2011. I had a call from where I originally bought the phone saying that I had a few days/weeks left of my contract and if I would be interested in an upgrade. I said "Yes" to the upgrade and got an iPhone 4s. It came in the post today and I put the new sim card I received inside the phone and turned it on. I went through the instructions about the language and location and everything else. Got onto the main phone and the connection came up with Orange T Mobile which is who I'm connected with. It also gave me the option of having my Wi-Fi on. I only ever use the Wi-Fi when I'm near to it, otherwise I just use 3G because it is easier. This is what I used to do on my Blackberry anyway. I tried to go on to Safari to go onto facebook and it came up with. "Safari can't be opened as there's no internet connection". I was really confused. Is there no internet connection because there's something wrong with the phone? Or do I need to wait for my broadband providers to allow the contract to proceed. I read online it can take up to 24 hours for a contract to be verified or something… But I'm not quite sure…

Would be good if I could have some guidance.