I found this.like it says THIS IS AT YOUR OWN RISK
Try this at your own risk. I will not be liable for any damage on your cellphone. Please let me know if it worked on your cellphone.
To unlock your Motorola V300:
1) turn off your phone, put in a sim card of a provider that it is not locked to, and turn it back on.
2) at the wrong card message, type *#9998*3323#. a message will pop up telling you to press exit, so hit the right softkey. choose number #7, your phone will reboot and your sim will work.
3) type *0141# and then hit call. this will give you a message saying your phone is personalized.
4) power down your phone and insert a sim card other than the one that is in it. power back up your phone.
5) at the sim code prompt type 00000000, that is 8 zeroes. AND THAT'S IT YOU ARE DONE....