I want to compile list of the maxis/hotlink codes. For reference. Please dont simply try this code as this code may charge you for activation fees or annual fees after activation..

*122# - Check Balance (FREE)
*100# - Easy Menu (FREE)
*109# - Activate Voice Mail (FREE) #109# - Deactivate
*136# - Activate 3G service. (Cannot find deactivation code)
*138*6# - Activate IDD132 (FREE)
*117# - Activate Background music
*126*012XXXXXXX# - Call-Me-Back (FREE 3 times/month when  no credit)
*139# - Check Your Mobile Number (FREE)
*135# - Activate PhoneBook Backup #135# - Deactivate
*133# - Activate GPRS (RM10)
*131# - Activate Caller Ringtone (RM3/month) #131# - Deactivate.
*110*Number of days# - Activate Push-To-Talk (RM1/Day) #110# Deactivate.
**012XXXXXXX - Voice SMS (RM 0.10/30 Sec)