Can I use another sim on my MTN mifi

If I use my mtn SIM for my mifi, will it become a dormant SIM. I am worried because I don't want the sim to be blocked.

i had an mtn mifi i was using then i lost the sim that was registered with the mifi and i dont have any details of the line any more please how can i register another sim on the...

#Mtn 4G mifi

Please, my MTN pocket MiFi is not charging and it is not coming on. I tried using a similar battery to power it on but it is not working. I tried charging the battery of the...