06-10-2015 08:12 PM - edited 06-10-2015 08:13 PM
What plan you are using?
Digi Postpaid Smart Plan 25/45/65?
If yes, just dial
*128#, reply 1 (My Account), then you just look for the Friend and Family and reply based on the specific number which you should be able to add your buddy number.
P/S: Only digi postpaid number are allow to add as your buddy.