Is it worth flashing an iPhone 4S to t mobile?

I have an unlocked iPhone 4S but sadly my carrier is t mobile & the iPhone is AT&T. Now I've been thinking about just flashing it through the tmobile store but honestly, is it worth it?

Why is my Iphone 4s Storage full?

Hey so i'm trying to download music onto my Iphone4s.
but its storage space is full.

It has no more storage space left.
I only have like 5 apps and about 40 pictures. No videos no music no nothing. Its relatively empty,
I find this really weird how can it be full?

It also won't let me take any more pictures. ):

Why does it say this? How can i free up space on it? I really wanna download my music.

My iphone crashed while updating?

I just got a new iphone 5 and it was working perfectly when I got it. I went home today to update it, and while updating an error occurred. Now the iphone is stuck on the screen where it tells you to connect the iphone to itunes, but it doesn't appear on itunes. I tried reinstalling itunes and everything, but nothing seems to work.

Random data spikes on iphone 5?

I have an iphone 5 and the carrier is verizon, I'm not sure how this whole data thing works but I get a text message almost every other week saying I exceeded my data limit or that I've reached 50% of it 75% of it and so on, I turned my cellular data off, deleted some apps, and some pictures and I keep getting a message that says I used 50% of my data allowance for the month, which I don't understand because I only turn my cellular data on when I'm outside, and then switch to strictly Wi-Fi when I'm in the house, is the cellular data still in usage while I'm using Wi-Fi? I also share a data plan with 2 other people who live with me, could it be that they're using too much data which causes my data to randomly spike up? How can I stop the data from randomly increasing?

Iphone 4S breaks after restore?

Basically I was backing up my phones contacts, onto my computer. My iphone 4s for some reason was running really buggy so i decided to restore the phone. But the problem is that when the restore was finished itunes said that the restore failed and I could only pressed ok. Which I did but now my iphone can't connect to the computer, but on the iphone there's a picture of this: http://grantzau.com/articles/article.asp?ID=53§ion=articles
Now I have tried doing the same process that it says on the website but itunes still doesn't recognize my iphone 4s.

Why can't I update my iTunes?

The "Apple Software Update" pop-up box comes up and every time i click "install" and then "agree"… The box just keeps coming up. I downloaded the newest Adobe update. I have an iPhone 5 and now I can't put music on from my laptop… Please Help! I've had the same iTunes for years… It say that it is version 2.1.3