IPhone blacklisted but its not stolen?

My friend had an AT&T iPhone 4 for about two weeks and then sold it to me. It worked perfectly fine while she used it, she was actually using it when she sold it to me. She took the SIM card out, and reset the phone. Almost immediately I put my SIM card in, network popped up but now my data isn't working. Checked imei and is now saying its reported lost or stolen? I know she didn't report it, and I know it's not stolen because she was using it, it was her phone. If the phone was still under her contract, would me putting my SIM card in it caused it to set off a red flag in AT&T's system? And that's why it is not working? Please any advice on this would be helpful.

IPhone 3G jail broken stuck on emergency calls only?

I got this phone yesterday and I'm trying to fix it. Second hand 3G was unlocked and restored and had Cydia installed.

Plugged in to computer using latest version of iTunes
iTunes error 2003 can't sync or update
iTunes recommends restore
Tried different USB port - starts to sync but as jail broken needs further software
Can't restore Error 1015
Dfu mode
tinyumbrella 'exit restore mode'

Phone now stuck on emergency calls only and not recognising sim

Does it Just Need unlocking now?

IPhone 4S not recognised by windows a d wouldn't charge?

Last night I plugged in my iPhone to caber and it wouldn't charge, so I tried 3 other official cables with no success, I plugged it into my computer to see that windows said the device had malfunctioned and iTunes wouldn't recognize it, I plugged it back in to the wall to see if it would charge overnight and it did, but I tried again in the computer and the same this happened, it did fully charge so it's probably not a hardware problem but I can't restore it as iTunes won't pick it up, I'm running iOS 7 beta 2 on an unregistered UDID so I imagine the Genius Bar is not an option, has this ever happens to anyone? And did anyone fix it without getting a brand new phone? Also is there any way I can restore to 6.1.3 without iTunes so I can go to the Genius Bar?

Help jaibreaking my iphone 4 ios 6.1.3?

I've been doing a bit of googling and struggling to solve this. First time jailbreaker here.

I've got an iPhone 4 running iOS 6.1.3 I've downloaded Firmware for iOS 6.0.
I'm having two problems that I think are connected…
I run redsn0w on my windows 7, get redsn0w to use the iOS 6.0 firmware I downloaded, jailbreak, and when all the white text comes up on my iPhone it gets stuck in a loop saying 'Please Wait… ' all the way down the screen

As well as that, when I turn the phone off I tried to see if it worked anyway so tried to 'boot tethered', but my iPhone just gets stuck on the Pineapple logo in front of the black screen. So then when I turn the phone off and start it back up again I'm just back to my regular iPhone with all my regular apps - no Cydia.

Can anyone tell me what's going wrong? I'm sorry if this is asked a lot, it would be so helpful if someone could give me some help though.

S4 vs Iphone 5 Signal Power?

I'm planning to choose between S4 and Iphone 5. However, I'm worried about the signal catching power of the 2 phones. Can you please advice me on which has better signal catching power and which network will be good (UK)

Iphone help backed up to itunes?

So i recently lost all my contacts on my phone and i went to go sync it with my last backed up files on itunes and i didn't know that it was last synced on dec 12 of last year. Once the sync was completed I was panicking because all my recent text messages and over 1000+ from my spring break cruise was completely gone because my phone did not sync with itunes. I went back to try to sync again and there was an option for "iphonenamejuly4". I thought that if i sync it to that, all my content will return to normal. After the sync completed, the latest text messages/images are from may. Where did the rest go? Is there a way that I can get all my context back?

Is the iPhone 5 a great product, if so what service provider should I get?

I'm thinking about getting the new iPhone 5, yet I can't decide which mobile carrier provider best suites my basic needs of a basic budget.
A. I want the iPhone 5 iOS 6 Platform with 64 GB Capacity
B. It's $399
C. I can only have service to this popular device if I'm under a
2 year contract or no commitment contract.
D. Only three mobile service carriers have what I possibly need. (AT&T, Sprint, Verizon Wireless )

Verizon Wireless has the Share Everything Plan where you get unlimited talk, text, and data with a 2 GB device for $100 per month.

Sprint has an unlimited talk, text, and data plan for $109 per month.

AT&T has Unlimited Minutes for $69.99 per month, Data Plan Option for 5 GB $50.00 per month
and Unlimited Text Messages is $20.00 per month but 20 cents per text and 30 cents per picture or video, that's only the pay per use.

My question is WHAT plan would be the best plan out of these three major cellular companies?