I was trying to secure my Sim card and I made mistake of trying to unlock it with the old Sim pack Puk before I did a Sim upgrade. It is now blocked. Need to unblock it. Please
Mtn sim upgrade is like a sim swap
You must drop your old sim
And put new one they give in Mtn shop or Mtn office
When u do that if still showing you 3g go to settings on...
