How to disable MSN mobile? (mobile icon next to my name whenever I'm offline)

How to disable MSN mobile? (mobile icon next to my name whenever I'm offline)

Long-long time ago I somehow (I don't remember now) activated some MSN Messenger feature that allowed me to receive messages sent to me as an SMS while I was offline. Now when I'm signed off, people see me as if i was signed on from a mobile phone... there is mobile phone icon next to me.