Mtn has decided to stop there BlackBerry services, just as Glo did some time ago!
BlackBerry users be quite ready to stop using your Mtn sim to subscribe for data.
According to Mtn,
"Dear customer, MTN Blackberry service will be decommissioned on 27/01/2017. Please upgrade to a smartphone and enjoy 100% bonus on any data bundle purchased"
Are you still using the low version of BlackBerry?