This a comprehensive look at how to subscribe to any MTN Internet data plans for Android, Windows, PC, etc.

Bundle Plan Price (N) Total Data Allowance Validity Period Activation Code (Text to 131) Activation USSD
10MB 100 10MB 24 Hrs 104 *104#
25MB 400 25MB 7 Days 105 *105#
100MB 1000 260MB 30 Days 106 *106#
250MB 1300 325MB 30 Days 109 *109#
500MB 2000 750MB 30 Days 110 *110#
1GB 3500 1.5GB 30 Days 111 *111#
3GBNight(9PM-6AM) 2500 4.5GB 30 Days 102 *102#
3GBDay(9AM-9PM) 6000 4.5GB 30 Days 107 *107#
3GBWeekend (Fri9PM-Mon 6AM) 3000 4.5GB 30 Days 108 *108#
5GB 8000 7.5GB 30 Days 101 *101#

If you find this a bit distorted, see the attached image. MTN added extra data to the original plans


I believe the plans above are the basic plans Nigerians most likely opt for. Other cool plans can be found from where I copied the above:
http://mymobnet.com/mtn-internet-data-plans-for-android-windows-ios-phones-and-pc/

I get 9gig for N3,500 from Airtel