Needed Materials

MTN New Sim (That is never been used to receive any MB/GB)
Nokia Touch light or old small Tecno phone

Here is how it works

Insert MTN New Sim in any of the stated phone above
Text 101 to 131

So simply as that, if your sim work for it, you should receive a successful message as shown in the above screenshot.

To check your Gigabytes balance and the validity date, text 2 to 131

Enjoy it while it last.

Source: http://payetech..com.ng/2016/04/hot-blazinghow-i-get-mtn-75-gigabyte.html