This might be much to late but I am posting this because I could not find a solution on the web.
I had a similar problem after moving my sim from another phone to the new 6210. In the end it was because there was old unread SIM messages on the SIM card. I deleted them and all was fine.
To do thes go to messaging, select OPTIONS, SIM Messages. Mark all and delete.
Which is the best Cell Phone having the feature of 3G in brand Nokia within price brand of...
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Which is the best Cell Phone having the feature of 3G in brand Nokia within price brand of Rs.10,000. Thanks in advance, jaypoo