Have you been checking or looking for a way to know some numbers(networks) off hand from their prefix? This is the tutorial that will help you with them to recognize any strange number. Someone called you with a number and it looked strange to you possibly because you are not familiar with the number the caller called you with. No problem! Wikipedia recently updated the list of all Nigerian Network providers prefix numbers for the public to be aware of and also get familiar with it.
The most popular prefix number in Nigeria today is MTN 0803 followed by Etisalat's 0809 (080naija) but there are unfamiliar ones like Glo's 0815, Airtel's 0701, Visafones's 07025, Ntel's 0804 and so on. I will be dropping more for you right away.
See list of prefix for all Networks in nigeria
ZoomMobile (formerly Reltel)
With this full prefix, you will be able to recognize any strange number easily and don't forget to drop more prefix you know via the comment box.