Here is another free 150mb data from mtn to its subscribers valid for just 1day.

No long talk, to activate yours, kindly dail *700*2*5# and send, then reply 1 to the popup message brought on your screen and send.And now, you’ll receive a message of a successful activation of 150mb for free.

Note: The data is only working perfertly for facebook but you can let it power all app and browsers with the use of VPNs.