Hi, Nkiru, You can check the roaming network your phone is connected to. To do this, visit https://www.mtnonline.com/personal/roaming-rates/ for the roaming network information also confirm that you have sufficient airtime.
i know its niot my NIN cause i've done that a couple months ago, and network comes onn sometimes whenever there is network issues in my area, and then stops working later...
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