Anyone with at least N100 on his or her MTN SIM was eligible for the free calls. Youths seized the opportunity to interact with others at length because that time WhatsApp wasn't available to everyone as it is right now and cost of call and SMS was high so the free midnight call was the only saviour and opportunity to talk like a big man on the phone.
I can remember one of my guy back then when we were in school that use to forge numbers and call at midnight. Most times, he uses it to talk with so many girls at length.
READ; MTN, Etisalat, Glo and Airtel cheapest call tariff plan & subscription
But recently, the night call stuff became boring and tiring meaning that no one wants to be disturbed again with calls when he or she supposed to be sleeping. There are many bad health effects of night calls but I would say what really contributed to the abandonment of this service is because of different methods people can use now to interact with others and pass messages across free of charge or very affordable. Some of them is the Facebook call, WhatsApp chat and call, some cheaper call rate tarif plans, Skype etc.
This is a statement from MTN on why they stopped Xtracool Midnight calls.
"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.
So guys how do you see this? Are you still making night calls at this time?
However, we are yet to here from other networks to know if they will follow suit.