Mtn has recenttly introduced a new package known as the MTN PULSE for her subscribers.
Its quite simple to migrate, simply dial *406# or send 406 in an sms to 131.
If you recharge N100 airtime or more in a week, you would be given 10MB Data that week without the airtime been deducted. I would call it an earlier idea from the etisalat counterpart.
You can now browse for free on your mtn network using this. Enjoy free browsing.