I tried exactly what you said... but now I have a lot of profiles as I can log in with both the old and new Mxit IDs!!! I now have 5 accounts as I can log in with 5 different Mxit IDs??? Is there really no way to unregister or deactivate other profiles? I only want to use ONE? Another concern is my main profile (the one with all my contacts and set backgrounds etc.) is registered with an old phone number of mine, I want to receive my offline notifications to my new phone number. PLEASE HELP!!!
Please go to Info, select option 7 - profile then select option 1 - my profile then you will be given a screen with your account profile. Select Mobile: (number) and click on edit, to change your number (Not Mxit id). One thing to note though, there is no offline notifications on Mxit as far as I know. You can also go to Options> Profile> Detailed Profile to edit your number on Mxit V6.
Is there really no way to unregister or deactivate other profiles?
Unfortunately there is no way to delete or Deactivate Mxit accounts. I would suggest removing the numbers from all of them (Not your main profile).