Here are the steps to know if your deviece is 4G Enabled.......

Ensure you are in a 4G enable area or Visit the nearest MTN store or any phone store near you to be sure the device supports Band 7 (2600mHz).

MTN NG makes their 4G LTE service available for all states in Nigeria. Following the acquisition of Visafone by MTN earlier in 2016, they have launched their 4G network and makes 4G data plans available for Nigerians while some of the users are already enjoying it.

MTN 4G LTE only available in selected states before, it is now available in all states. To use MTN 4G data plan, you must be using a compatible phone and must have swapped your sim for MTN 4G sim card from any MTN office nearest to you before you can be part of MTN 4G evolution.
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Read More: http://www.techmej.com/2016/10/how-to-activate-mtn-4g-lte-services-on.html