hmm i think it is not a simple solution for your 6682 phone'
your phone IC driver for simcard socket is damage' your phone can't read your sim'
but first try to check all contacts in your phone sim socket'
and try it to turn on' and if the prob. is desame, your phone IC is damage, offline mode means insert sim....

if there is a cellphone re-pair shop nearby'
much better to bring your phone to a cellphone technician...


here is the pic.