For example, if you want to send 5000 to 08030000000 and your PIN is 4343
Dial *600*08030000000*5000*4343#
B. SMS
Transfer on MTN line using SMS by doing the following
1. Send an SMS with "Transfer, Recipient's Number, Amount and PIN" to 777. For example, you can send an SMS with "Transfer 08031234567 1500 1234" to 777.
2. After sending this message, you will receive an SMS asking you to confirm that you want to make the transfer. Cofirm the transfer by sending an SMS with "YES" to 777.
How to Transfer Airtime on MTN Line
MTN Transfer Code: *600*MTN Number*Amount*PIN#
You can transfer on MTN using both USSD and SMS
A. USSD:
*600*MTN Number*Amount*PIN#
For example, if you want to send 5000 to 08030000000 and your PIN is 4343
Dial *600*08030000000*5000*4343#
B. SMS
Transfer on MTN line using SMS by doing the following
1. Send an SMS with "Transfer, Recipient's Number, Amount and PIN" to 777. For example, you can send an SMS with "Transfer 08031234567 1500 1234" to 777.
2. After sending this message, you will receive an SMS asking you to confirm that you want to make the transfer. Cofirm the transfer by sending an SMS with "YES" to 777.
Check Here for How to Change MTN transfer PIN