Codes for 3G service & about divert calls

Codes to activate or deactivate 3G service

*136*4# is to deactivate 3G

*136# to reactivate 3G

I have trying to configure to divert all calls (always) but not successful (even if my mobile line is 2G, GSM or 3G), however this call diversion is possible only if the settings are selected :

Divert if out of reach
Divert if not available
Divert if not answered (can define no. of rings before diversion)

Divert all voice calls (I just unable to activate it, and error message prompted:
"Divert always Command error"
and I just do not understand why it is not possible, for my mobile line (Maxis) and I had questioned this issue in the forum, but nobody can provide me the answer :(

Codes for request settings (Maxis/Hotlink)

*136# --- to activate Maxis 3G and *136*4# to deactivate 3G.

*133# --- To activate GPRS and #133# to deacitvate GPRS.

*147*1# --- To enable Missed Call Notification service and *147*0# is to disable it.

Call Me Back service (you may only able to use this service when barred (maxis) or inactive/deactive status (hotlink):
*126*012xxxxxxx#

*109# --- To activate Voicemail and #109# to deactivate Voicemail

Maxis PTT (Pust-To-Talk):
*110*1# --- for one day use and *110*30# is for one month use (30days).

*135# - Activate PhoneBook Backup (RM2/month. Sync charges apply) #135# - Deactivate

Check registration status (prepaid): Type REG and send to 22555

*122# --- To check credit balance
*100# --- Easy Menu
*

Talk & SMS Plan:
*108*4# --- To change from Talk Plan to SMS Plan
*108*1# --- To change from SMS Plan to Talk Plan
or call to change the SMS Plan & Talk Plan - 1300-820120