I'm using a Nexus One with stock froyo.

Last week, my old sim just died on me, so I had it replaced at a maxis centre for RM 10.

When I was using my old sim card, my phone number displayed just fine in About phone > Status, however after replacing the sim card, it now displays as Unknown.

I have an old Sony Ericsson K800i and I tried to edit the phone number by going to menu-->contact-->more-->options-->special numbers-->my numbers-->my mobile, but the "Edit" option wasn't displayed. (Maxis probably locked the sim card or something?)

What can I do now to fix this issue? Without the phone number displayed, my messaging app isn't displaying my picture properly. If I were to call Maxis, what should I say to them?

tell them what u written here

As above poster said, going directly to Maxis is better. As they probably have more experienced technicians.

My friend using X10 unlock UK one also had the same issue till cannot use the TiLk...had call Maxis before but informed nothing to do with them....