Prepaid:

Add FNFRemove/Delete FNFChange FNF
Through SMSThrough ussdThrough ivrThrough SMSThrough ussdThrough SMSThrough ussdThrough ivr
Send SMS to 3300 by writing add [space] 01xxxxxxxxxDial ussd *166*11*019xxxxxxxx#. 
or dial *121*4*2*019XXXXXXXX#
Dial 123, select 4th option and follow the instructionSend SMS to 3300 by writing rem [space] 018xxxxxxxxDial ussd *166*13*019xxxxxxxx#. 
or dial *121*4*4*019XXXXXXXX#
Send SMS to 3300 by writing ch [space] 019xxxxxxxx [space] 018xxxxxxxxDial ussd *166*12*old number*new number#. or *121*4*3*Old number*New number#Dial 123, select 4th option and 
follow the instruction

Postpaid:

Add FNFRemove/Delete FNFChange FNF
Write desired FNF numbers separated only by space and then send to 3311. Mobile number with country code (880 or +880) will also be acceptedWrite rem 01xxxxxxxxx and then send to 3311 to remove the respective FNF number. Multiple numbers cannot be removed at the same timeWrite c 01xxxxxxxxx 01xxxxxxxxx (the 1st number is the existing number & the 2nd number is the new number) to change FNF numbers and then send to 3311. Same procedure for changing 2nd and 3rd FNF number. Multiple numbers cannot be changed at the same time