If I have an iPhone with Virgin Mobile, can I switch to AT&T?

Ok so I want to switch my iPhone 4S that's registered with Virgin Mobile and my dad went to go check it out. He said we might switch but I need to change my phone. I want to keep my same phone AND number. But I might just get the iPhone 5, but can I keep my same number even if I moved to another state? But also lol I want to keep all my photos, apps, and everything it's just every time I plug my phone into the wall, it says there's too much data to backup. I have an app with a bunch of music but last time I switched from iPod to iPhone, All my music was lost! My father wants to put all four of my family members in one plan. Should I switch? The only two reasons I want to switch is because AT&T has 4G and I might get the 5. I know it's stupid but l would have to download each 361 songs All OVER again which is really annoying. Anyone have experience with switched from Virgin to AT&T? It's more pricey but my brothers phone is broken and my mom's doesn't really work that much since they don't have a tower for that company.

How to back up iPhone to a new laptop?

Recently my laptop had to be restored and everything in it was lost. There's no way of getting my old data back. Now since I want to connect my iPhone back to my iTunes so I can save and back it up it will only reset everything on my phone. Most of the music I have on there's from CDs that I don't have anymore so it's crucial to save this back on the laptop without it erasing whenever I sync it to my iTunes. Is there any way I can back up my iPhone without losing all of my stuff and still having it saved onto my iTunes?

Added (1). I've also heard of programs to use, but I don't want to pay money for them. I used one before I had to restore this laptop because I was in the same predicament, but I don't remember what the name of the program was.

How to reclaim deleted texts on an iPhone?

I got into a huge fight with my girlfriend while drunk the other night, and we were texting each other. I don't remember much of it because I was drinking, but I know it was bad. She's super pissed and won't tell me everything that happened.
But also, I woke up the next day and the texts were deleted. I know I wouldn't have done it so it had to be her.
Is there a way I can reclaim/recall those lost texts to see what it was we were saying to each other?

My phone upgrade is coming up. GS3/4 or Iphone?

My upgrade for a phone is coming up soon and I'm having trouble deciding if I should get a Galaxy or an Iphone. I'm in highschool and have a job so i'm going to be using the internet and e-mail a lot. I know how to use an Iphone extremely well because all of my friends have it so getting used to it would be no problem.

Problem with my Pioneer stereo system in my car?

I have a Pioneer stereo system in my RAV4.It works great with the radio and with CDs, but when I have my iPhone plugged into the auxiliary input, the sound only comes out of the right side. I have replaced the cable several times so I know my cable isn't the problem. I've also tested other devices, so I know it's not just my phone either. Anyone know what the problem is? Any help is appreciated!

Apple iPhone 4s Update iOS7

I have the iPhone 4s, my software is iOS 6.1.3 will I get the iOS7 update anytime soon or is it even out? I hear people talking about it but have no idea?

How much will it cost to upgrade to an iPhone 4 at Verizon?

I'm eligible for an upgrade in February. Right now I have a Droid Pro, and maybe it is just me, but I had problems with this phone. I really want an iPhone 4, and my dad said if I saved up the money and paid for it myself, I could have it. February is quite a few months away, so I know I have the time to save up my money.So, How much would it cost to upgrade to an iPhone 4 with Verizon wireless?