I say make I update our people as Nigerian Communication Commission (NCC) Don approve the same short codes for all networks wey dey our country. As e be now, you no need to cram plenty codes for head again for the multiple sim cards wey you get. Once you know the NCC harmonized codes, everything Don set for you. Whether na MTN, GLO, AIRTEL, 9 MOBILE (Etisalat) the code na the same now for recharge, check balance, share airtime, borrow money, buy data and also to communicate with the customer services. The image below contains the short codes.
How una take see this move by NCC? As for me the thing make sense die. No more asking about in case you buy another network sim wey you no dey familiar with their codes. NCC Don cover you already with this new development.
Note: the previous codes for each network still dey active and working fine. You fit use the former code or the new approved code.