What to do when MDN and MSID given by service provder are different?

[frenchie]

I've seen this with people who ported their number to a different carrier.

This does not really affect anything. I have Verizon and my MDN and MIN numbers are both different. In fact I called my MIN number and got some strange person's voice mail!

I didn't port my number and my MIN and MDN are different. Unless your service is disrupted then don't worry about it.