This is the latest MTN free calls codes blazing now as at July, 2016. It's not hard, and it's not as you think. You need to follow my below steps.
Enjoy this Mtn free call tweak while its blazing. You'll be accumulating free Airtime by just dialing the codes am going to drop now.
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HOW TO MAKE FREE CALLS ON MTN
Kindly dial *460*6# or *460*3#, you will receive a welcome message. Once you received the welcome response, you will be given N50 to call any network.
HOW TO ACCUMULATE THE AIRTIME
Inorder to accumulate more Airtime and make free calls, you just have to exhaust the N50 bonus airtime and re-dial any of the codes i gave above.
Repeat the steps again and again to accumulate more N50 airtime to call any network. N50 is about 4minutes of call.
Check bonus Airtime by dialing *556#.
Enjoy while it last.