We use Tmobile and their customer service is awesome!!! When we lost my nephew last Feb my minutes got burned up so fast while staying at the hospital with him....I called them to ask about the charges for additional minutes they gave me 200 more for free and said when they got low to call them back and they would add more....that during a time like this worry about minutes should be the last thing on my mind.... How often do you get THAT kind of free service???? They also did it again when my son's job required that he use his phone a lot during the KY derby and again....free minutes were added on!!!! As long as you contact them before you completely run out.... and it is easy to check and see what your usage is right from the phone, too.
They are quick to help with any problem and I have only had a few times that I have needed their help....we have been with them for almost 8 years and because of being a loyal customer they offered us an unlimited minutes plan for only $20 more than what we were already paying!!! I highly recommend them!!!!