MTN is currently giving out free 500MB worth of data to their subscribers especially to those who subscribe to N1000 monthly data subscription which normally gives you 1.5GB of data but now you will be rewarded with additional 500MB making it 2GB in total.

Now you will enjoy 2GB data for as low as N1000 only and no longer 1.5GB, as usual, to subscribe to this data plan simply make sure that you have up to N1000 on your phone and then dial*131*1#

Note that the bonus lasts for 7 days only which means you need to consume the additional 500MB bonus before 7 days or it will no longer be available.