If you migrate to MTN true talk tariff plan, you will enjoy FREE Happy Hour calls to MTN numbers from 00.30am to 04:30 every day (including weekends) as long as you have minimum balance of N100 in your account. So, this simply means you can make free midnight calls to your loved ones provided you have at least N100 on your MTN line.
The MTN TruTalk is the default prepaid tariff plan that allows you to enjoy 20 kobo/sec for MTN2MTN calls and 26k/sec for calls to other networks from the very first second plus other exciting products and services.
Besides that, MTN tru talk tariff plan lets you make discounted calls from your mobile phone, at 11 kobo per sec to 11 registered numbers (either 11 MTN numbers or 11 numbers on other networks).
If you want to migrate to MTN true talk, dial *400# or send 400 to 131 on your MTN line.