I got a Nokia 6820 that worked with ATT. Now from some odd reason after I unlocked the phone and put my Cingular SIM card in it, some of the features seem not to work right, especially the text messaging. When I try and send a text message – I go to menu- messages – text message – write the message – then click on send, and instead of number it’s asking me for an email address. Before hand it asked for a number. How can I fix the text messaging in my Nokia 6820 that is not working after switching to Cingular SIM card? Please help. Thanks.