Is it possible to get a pre-used iPhone on a Tmobile plan?

My phone is broken and my friend has offered to give me her old iPhone 4, my mother thinks it's impossible to get an at&t phone on our tmobile plan, I don't think that's true? And if we do that will it cost any money? Will I get a new number or sim card?

Why is my iPhone taking forever to send text messages?

I have an iPhone 4 and I don't know why just all of a sudden it's taking forever to send messages! My phone keeps saying storage almost full so I don't know if that's a problem but I deleted a lot of my messages and it didn't do anything but can someone help me and find a solution? What can I do to make it stop, thank you

What device should I used for music?

I just got a samsung galaxy s4 to replace my old beat up iphone 3gs. I already have a 1st gen ipod touch. What should I keep, the ipod or the iphone 3gs for playing my music? One of them is getting sold, as one of them would just be collecting dust.

Can you fix a bad ESN, MEID number for an iphone 4?

So today I bought an iPhone 4 off of craigslist and come to findout the phone was reported lost or stolen and I get robbed of 120 dollars.
I was just wondering is there anything I can do about that? Can I fix the ESN/MEID number back to being "CLEAN"?

How to activate emoticons 2 on my iPhone 4?

I did the whole process, where you go into settings> general> keyboard> international keyboards, than from that youre supposed to go to "add more keyboards" and click emoji. But the thing is, I already have the emoji keyboard, because i already got an emoticon app (except it has less pictures than the app I just got). Do I have to delete the old emoticons app? What do I do?

Is scanning a LAN for devices connected to it illigal?

I got this app on my iPhone called Fing - Network Scanner by Overlook Soft, and when I connect to Wi-Fi, it lets me see what devices are connected to the same Wi-Fi. It also gives me that device's IP address and MAC address. Is this considered Port Scanning? Please enlighten me, I don't want to get banned by the Wi-Fi or get that Wi-Fi banned by its ISP. If intent is important, my intent is just to know out of curiosity.

Why is there a black line through the camera on my iPhone 5?

There's a horizontal line on my back camera that looks like a grid. I can see it while I'm taking a picture and in all the pictures I take the line is there. This phone is 2 days old. Never dropped. Is it a crack in the camera or how can I fix it?

How to switch from an iPhone to another iPhone?

I cracked my screen a few weeks ago and my brother told me I can use his old iPhone 4 since he upgraded to an iPhone 5. How would I transfer literally everything from my cracked iPhone to the one my brother gave me? Like I want LITERALLY EVERYTHING to be the same except not have a crack in the iPhone.

What device should I used for music? - 1

I just got a samsung galaxy s4 to replace my old beat up iphone 3gs. I already have a 1st gen ipod touch. What should I keep, the ipod or the iphone 3gs for playing my music? One of them is getting sold, as one of them would just be collecting dust.

Added (1). The ipod already has all my music on it, but I can always transfer it to the iphone, if I decide to sell the ipod.

Sprint iphone 5 on virgin mobile?

Just wondering… I have a sprint iphone 5 but I want virgin mobile. I know the iphone 5 takes a sim card. If i buy a virgin mobile iphone 5, activate it, put the sim in the sprint iphone will it work? I would then buy another micro sim and put it back in the virgin mobile phone and return it.