access to the service for a period of 7 Days.
See Also: How to Subscribe for the MTN Whatsapp Plan
Code for Activating FREE MTN to MTN Calls
To Subscribe for FREE MTN Calls offer, simply dial *567*3*8# and make sure you have a minimum of 50 Naira as your account balance.
The 50 Naira will be deducted as activation fee then you will get an SMS confirming that you can now make calls to MTN lines as long as you want.
I hope this was helpful, remember to share your opinions via comments. Enjoy!