MTNL 3G services can activated by using the following codes.
|SMS(Prepaid)||ACT 3G to 444|
|Dial ( postpaid)||1503|
To activate MTNL 3G, you can send an SMS with content ACT 3G to the number 444,in case of prepaid. For MTNL postpaid, MTNL 3G can be activated by calling 1503.