A co-worker has a Siemens SX56 PDA phone. They were with AT&T when Cingular took over. The cingular dealer gave him a new Sim Card for it to work with Cingular. He told me it is asking for a Sim lock code. Cingular told him to call AT&T. AT&T said to call Siemens. He is going to call them some time this week. I thought I'd ask here to see if there is a default code or some way to unlock it. Any help is appreciated.
I looked in the HoFo marketplace and I didn't see the specific model listed under any of the unlock sites.