Nokia insert sim track mising problam
try your sim in a different phone and make sure its not just a bad sim. if it is a bad sim most companys will give you a new one free of charge. if it works in another phone you'll want to do a master reset to see if its a software problem or a problem with the actual hardware (the metal connections that interact with the sim).
to do the master reset per,http://nds1.nokia.com/phones/files/guides/Nokia_1600_UG_en.pdf
select menu, settings restore factory settings, then restore all. if it asks you for a code it will be 12345 or 1234 unless you set another pin in which case it will be your pin. i hope this helps
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