The offer is for MTN customers who havent activated
their 4G LTE network. The bonus data is to welcome
you to the fast 4G network and it can be used for
browsing, downloading, streaming etc.
To Get Your Free 5GB Data Reward
1. Get an MTN 4G LTE compatible Smartphone
(supports band 20 (800MHz) and Band 7 (2600MHz)).
2. Insert your MTN sim card into the device.
3. Then send 4G to 131, you'll get a reply thus:
"Yello! You need to upgrade your SIM card and device
to enjoy MTN 4G LTE. Please visit the nearest MTN
store or partner retailer to upgrade now.
For more information of MTN 4G LTE, including 4G
coverage location; please visit www.mtnonline.com/4g
or walk-in to any of our service centers nationwide.
Screenshot below:
4. If you got that message, it means your phone is to
use good MTN 4G, just run to the nearest MTN store/
outlet to do a 4G sim-swap.
5. Finally, dial *131*4# and the free 5GB data will be
smile to you.
Remember that the Mtn 4G Sim card support only the
specified 4G band.
Source: www.getontopc.com/2016/10/mtn-4g-lte-usersyou-can-now-get-your.html?m=1

What if my phone doesn't support that band... Will I still be given the 5GB?

valnelly:
What if my phone doesn't support that band... Will I still be given the 5GB?

you don't need to panic all you have to do is check out the list of all smartphones that support 4g networks here=》 www.getontopc.com/2016/10/list-of-smartphones-that-are-compatible.html?m=1
if u did not see ur phone in the list there u will see a link where u will fill up some coulums to determine if your phone support it or not if it does they will let you know

what is the duration of the Free data , is it for one month ?

cleanshaven:
what is the duration of the Free data , is it for one month ?

I am interested in this. Anyone gat a valid answer?

Obviously Mtn did not state the validity peroid had it being they stated it u would have seen it in the post but I know it valid as long as u did not finish the 5gb