Wrong SIM card error

[Oldster]

I have been unable to access my P900. It keeps saying Wrong SIM Card. My SIM card works fine with other fones. No other SIM card works with the P900 so I figure it must be a problem with the fone. Has anyone else experienced the same problem? Is there a way to fix it?

[dtsm]

did you buy a "locked" phone that only accepts sims card for one specific carrier?

[Oldster]

No, I've been using the fone for about a month. the problem just developed today.

[Sutitan]

Try getting the latest firmware from there site. If you already have it. well instal it again. Then retry. If that doesnt work contact sony ericsson and they should be able to replace it. I hope.