I suppose you held down the power and home button to force shut down, they tried to restart.

i didn't, now i have, and here we are. cool.

A former supervisor used a well-cracked iPhone 3 for years, still uses it.

However, if yours is done then it's clearly a different matter, two different phones.

I'd try that hard restart, holding down the power and the home keys simultaneously

http://www.hardreset.eu/apple_iphone_hard_reset_soft_reset_en.html

my phone is fine, my excuse to upgrade, however.........

...better that you upgrade, for safety sake!

i hate them assholes.

But you have to buy the phone that fits that plan.

I think.

Check here:

Current AT&T iPhone 5 will work on T-Mobile LTE, HSPA+ 21 networks

http://www.macworld.com/article/2032256/current-atandt-iphone-5-will-work-on-t-mobile-lte-hspa-21-networks.html

but it is a lot more expensive. we have several phones on our account, so.....

for the iPad/iPhone/Macbook running, plus tethering, ATT, seems like a fair price...