As you might have know, MTN Nigeria is currently giving out free credit and free sms to its subscribers through what they call Recharge Promo but unlike other networks, you can see your awarded promo via your main account menu when you dial *556#.
Currently MTN gives its subscribers a discount of the recharge denomination they loaded i.e if you recharge N200 you will receive N50 free airtime credit allow side some a discount on free SMS (Short Message Service).
These free promo Airtime and free text credits can only be used within the MTN Network, that is for MTN – MTN Numbers hence if you are calling other networks or sending an sms to other networks, you will be charged on normal rate from your main account balance.
How To Check Free MTN Promo Free Airtime For Calls and SMS Given
Like i earlier stated, if you check your main mtn account you won’t be notified of any bonus there so what you need to dial to get your free credit for calls and text message is dial *559#.
Do you get that? Ok just dial *559# and send and you will see how much free credit you have for calls and sms.
Hope this helps?