Are users allowed to pay more money on a monthly bill to pay off the phone faster?

Hi, I am an AT&T user with AT&T number (edited as per community guidelines). And recently I want to cancel my AT&T service.

need my account number

I returned my phone in April within the given 14 day return period... still paying on it in Sept and no credit for all these months. I have so many di

My bill is normally issued on the 6th of the month but nothing yet, is there a problem with the billing system & if so can you communicate that to

HELLO,( PLEASE SOMEONE HELP ME) I WAS A AT&T  CUSTOMER WITH HOME SERVICES FOR OVER 6 YEARS. SO AROUND JUNE 2014 I DECIDED TO START CELLUAR SERVICES WI

Hello, I currently have Mobile Share Plus - Business 3GB with 4 lines and currently pay a little shy under $150 (tax + fee + discount). All smartphone

If I block my # on an outgoing call, does the # I call still appear on my bill? I can understand "blocked" appearing on an incoming call, but an outgo

Also is it possible to switch main user of AT&T phone account to someone else if need be?  

Hello Everyone,I am fighting at&t customer service for 2 months for now for false charges they posted on my bill. Does anyone know where to send forma