IPhone 4 sim locked, same carrier?

I have two iPhones here, an iPhone 4 7.0.2 and an iPhone 4S 6.1.3
both are not jailbroken and recently i switched the contents of the phone and switched sim cards as well. Both sim cards are from the same carrier and both are being payed monthly (post-paid)

when I switched sims, the sim i used on my 4s is locked on my iphone 4, but the sim on my iphone 4 is okay with the 4S. Again, they are of the same carrier.

How do I fix this without jailbreaking?

Apple security and passwords?

I have an issue with someone being accused of accessing the security settings on an Apple Mac computer "to get the passwords."

I don't have an apple computer so wondering if this was possible? Surely it works like an iPhone/iPad that when you want to access passwords etc then you have to put in a pass code/password to access it?

Also what kind of passwords can you access through the security settings? Is it just the apple passwords and Wi-Fi?

How to unlock an iphone 4 from sprint?

I have an sprint ihpone 4 and i would like to change to t-mobile but i found a problem the ihpone 4 has no sim card slot so i was wondering if there's any other way to unlock and change the carrier network?

Any software for the iPhone to get music?

Not long got myself a iPhone and I need an app to be able to download music, when I had my android I had an app called tube mate and it allowed you to download the videos on YouTube but I used to download as mp3, was wondering if there's any such thing for the I phone?

ITunes problem: can't sync ipad, iphone after reinstalling Windows XP?

I had to reinstall Windows on my PC, and obviously I also downloaded itunes once again. But now i can't sync my ipad and iphone! I want to add new songs on my iphone and I can't!

When I try to "sync music" it says //"Are you sure you want to remove existing music, movies, TV shows, books and tones from this iphone? "---"---"from other itunes libraries will be removed and items will be synced from this itunes library."//

SO, should I click "remove and sync" or what! What exactly will happed after that, what information/files/apps will be deleeted? I'm afraid of losing all my photos and videos! It's not a big problem if the songs disappear, but just not the photos. How to solve this problem?

IPhone lock button broken. Can turn off but how do i turn it on?

The lock button at the top of my iphone is broken, but i have been using it fine as i have turned on 'Assistive Touch' and have been using the white dot that appears on screen.
However, I'm worried about turning it off, and surely the white dot will disappeaer when the phone is off, and I will have no way of turning it on?

Am I correct in thinking this?