SOURCE: insert sim card
that s because there may be some problem in the sim card holder or the sim card holder is in loose contact ...
just open the handset and remove
and clean the sim card holder with some alcoholic solvent and refit that
correctly and then get your mobile phone working for the sim cards ...
any doubts you can reply me
rate my solution ..
have a nice day
SOURCE: problem regarding mobile sim card chang
Your phone is asking for a code because it is locked to only work with one phone company. If your new sim is from a different company, you can request the unlock code from your old company, they may or may not give it to you (tmobile usually does, ATT/Cingular usually doesn't). The other option is to use a unlocking service, you can find plenty on ebay. If you didn't change phone companies, your new sim card is most likely bad, have your phone company send you another one.
SOURCE: insert correct sim card
No need of disturbing your self to solve this problem check this site www.gsmsolution.com
SOURCE: my samsung says insert sim card...
u should have to check your sim card nd insert a sim car in right way
SOURCE: i have sim access problem in my samsung sgh-x210 mobile.
because the phone is locked to the specific carrier
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