@Afriman, seems the LTE sim I was given is faulty. Tried it in my MiFi device and it didn't work. The MiFi sim worked in the Zest phone.
How do I get a new sim?
Thanks for testing further for me. Seems like the issue is with the SIM. Let's see what MTN have to say about the SIM either being faulty or blocked. Either way, we'll get that sorted and at least you know your phone works