Question: do a sim swap on mtn?
Answer: SMS the word 'Swap' from your OLD SIM to 44770 (standard SMS rates apply)
You'll receive a one-time PIN (OTP), which is valid for 15 minutes (write it down)
SMS 'Swap(LTE SIM number)*(OTP)#' to 44770, e.g., Swap1234567890*1234# (standard SMS rates apply)