As released by MTN "Please cascade to the associates that MTN happy hour call (Free night call) which started October 2006 has been discontinued effect tonight, as directed by NCC. Hence, all happy hours calls will be billed from tonight.Thank you."
Before this news, MTN users with a minimum of N100 in their airtime balance, can make free night calls from 12:30AM to 4:30AM but going forward, that has been discontinued. Calls within that period (happy hour) will attract normal charges. Despite the facts that NCC has lifted regulatory ban on MTN for several infraction, this is not the change users bargain for.
But if you still make use of Glo, you can opt in for glo to glo free mid night call.