There's a way to unregister your number, but the id shouldn't be an active one.
Unregister Instructions:
---Login with your mig33 ID. ( This ID shouldn't be an active one)
---When you log in you will be prompted to choose one of three options. (i.e. ENTER CODE, RE-SEND CODE and REMIND ME LATER). Choose RESEND CODE option.
---Enter any other phone number in the textbox provided. You can enter any imaginary number, too.
---Click SEND
---Finish. Your number is free.
Note: you cannot unregister an activated ID. Once you register a nick, you can't register another ID on to the same number without this trick.
Unregister Instructions:
---Login with your mig33 ID. ( This ID shouldn't be an active one)
---When you log in you will be prompted to choose one of three options. (i.e. ENTER CODE, RE-SEND CODE and REMIND ME LATER). Choose RESEND CODE option.
---Enter any other phone number in the textbox provided. You can enter any imaginary number, too.
---Click SEND
---Finish. Your number is free.
Note: you cannot unregister an activated ID. Once you register a nick, you can't register another ID on to the same number without this trick.