No, it will give an error message asking for the unlock code. Once you get that error, you screwed up the sim and it will not work in either phone again and it screws up both phones. Nextel does not have the unlock code, Motorola made the phones that way. Motorola will not provide the code either.
It all depends on what phone you are talking about and exactly what it is that you're trting to "unlock". The different phones all have different operating systems and those all use different codes for different functions. You need to be more specific.
This code was deleted. In 2006 the coding procedure for injections was changed and 90772 was made the universal code for all injections. This was again changed in 2009 and 96372 is now the universal code.
The Universal Product Code is a combination of electronically readable lines (the bar code) and numbers identifying the product and providing inventory and pricing information for producers and resellers