This is the easiest method to transfer an MTN Data bundle from one line to another, I’ve been using it. So you also can try it out.
Just on your phone and dail *131*2#, it will show a message.
Click on reply and enter 3, after that, choose the amount of datas you’ll like to transfer and enter the number you are sending it to.
If it requests for code put 0000.
I hope you enjoy this little trick used to transfer MTN Data bundle.