Master clear code for V600???

I've had this phone for awhile and my t-mobile contract recently ended. My employer is going to get me a phone so I did not renew my contract. My service is currently no longer working.

I'm selling the phone, and as such, I'm trying to do a master clear to set it back to factory default. It's asking me for a 4 digit code and I don't ever remember setting one.

I've tried the last 4 digits of the phone number I had but that's not working. I've tried 0000, 1234, and nothing.

What can I do in this situation? Any information would be greatly appreciated. Thanks!

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Motorola Factory defaults for 4-digiit code is - 0000 or 1234
or when it ask for 4-digit unlock code press menu and enter the master codes if you haven't change them it will ask for a six digit code the defaults are 000000
or 123456 or 012345

0123?

Nope. None of them are working. Does the last 4 numbers of your phone number sound familiar? Seems like I remember that might be the code. Thing is, since my plan is over I don't have a number anywhere. Can that be tied together like that or is that completely wrong?