Status Screen: under "my phone number".....???

[AC Question]

On the "i" page of my S5, right under the "update" line, is a line for "Status". Further under that is "my phone number'.... and directly under THAT is something called "MIN" with a phone number listed. I do not know this phone # and I don't know what "MIN" means or stands for...
Some clarification please...? Help...? ..lol