Trying to get old Motorola Select 2000e unlocked

[adam917]

Originally Posted by inquisitor

Unfortunately I can't help you with the unlocking problem and I think it will be quite a problem to find someone, who still owns the required hard- and software for unlocking such an old phone.
But be aware, that besides the form factor back in the days SIM cards worked with a potential of 5V, while current ones need 3.3V. Unless your SIM card is 5V-compatible, it won't work in such an old phone.

Well I have multiple SIMs. How do I find out which support that voltage? When did that change-over from 5 V to 3.3 V take place?