MTN Tru Talk was recently relaunched by MTN Nigeria in an attempt to to make it easier for people to talk. The default MTN tariff plan now makes it possible for MTN subscribers to call MTN numbers at 20 kobo/sec while enjoying 26k/sec for calls to other networks.
Besides that, MTN subscribers on the tariff plan can call 11 registered numbers (either 11 MTN numbers or 11 numbers on other networks) for as low as 11k/secs while also enjoying free mid night calls from 00.30am to 04:30 every day (including weekends) as long as they have minimum balance of N100 in their account.
To Migrate to MTN TruTalk, dial *400# or send 400 to 131.
You can check out the full benefits of MTN Tru Talk Plan here.