To get through to customer services, dial 150, then press send. Assoon as the call is active,press options, then select send dtmf. Now type in 150, then press ok. you should hear 3 beebs, and a second or two later, you'll get put through for free.
Ever deleted your voicemail number? If on T-Mob, dial *#67# send, it will show your voicemail number.
Press #225# then send to check your credit balance . Press *#646# then send to check minutes used.
#646# will show a T-mobile user how manyminutes used and remaining also the date of bill close. #674# does the same thing for texts.
On Hungarian T-Mobile you can see your own number by typing *121#
On any T-Mobile phone you can dial +16111 and then the number you arecalling to call out 4 free. It's great when ur out oftime on prepaid. You'll hear a female voice saying something like ur call can't be completed. Hang up and immediatelycall back. (not tested, report if it's not working.)
On T-mobile to get your account balance call#999#

Important Note !
Try these Codes at Your own Risk ! I don't accept any Complaints.
Some of these Codes may not Work.
.•°°°•.
Please vote with 10 points for this site a--a.secret.mobile.codes.peperonity.com , if you enjoy the secret of mobile codes and more...
It would be great if it became site of the weekin the future