Here are approved unified codes for telecom services in Nigeria by the Nigerian Communications Commission (NCC).
300 is the code for Call Centre/Help Desk on all mobile networks
301 for voice Mail Deposit
302 for Voice Mail Retrieval
303 for Borrow Services
305 for STOP Service;
310 for Check Balance
3111 is for credit recharge.
312 is for Data Plan
321 is for Share services.
323 is for Data Plan Balance
996 is now for verification of subscriber identity module (SIM) registration or NIN-SIM linkage.
2442 is retained for Do-Not-Disturb (DND) unsolicited messaging complaint management.
3232 is also retained for porting services, otherwise called mobile number portability.
