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If your Nokia 6681 displays Invalid Sim ,it may locked to some network,You need to unlock it to use other GSM Network sim card....Visit the site Mobile-unlocker.com/nokia-6681/rs2wp9/ get the unlock code at reasonable cost and unlock it easily.Then use any gsm network sim card.
try resetting your phone with *#7370#...it may be a corruption to your phone settings. make a backup of your phone memory before going ahead with the code as it would delete all user details (phonebook, messages, calendar, notes, etc) stored on your phone memory.