blackberry help needed

[Mahado]

anyone know how i can check how much airtime i have left on a blackberry ?
I've always been a contract user with MTN but they messed up somewhere and my contract has changed to a pay as you go service. is there any call cost app on the blackberry which lets me know how fast the airtime is going and how much is left ?

Thankies !

 

[Claymore]

How do I check how much airtime I have left?

It's easy to get your balance. Just dial these numbers:

Vodacom
Dial *100# "Call".
The balance of your account will be displayed on your screen.
If your cellphone does not have the *100# option, then dial 5151
"Call" and listen to the voice recording of your balance.
Press * to exit.

Cell C
Dial *101# "Call".
The balance of your account will be displayed on your screen.
If your cellphone does not have the *101# option, then
dial 141 "Call" and listen to the voice recording of your balance.

MTN
Dial *555# "Call".
The balance of your account will be displayed on your screen.
If your cellphone does not have the *555# option, then
Dial 555# "Call" and listen to the voice recording of your balance.

From http://www.nashuamobile.com/nm_portal.asp?link=prepaid_faq&siteid=ver5