If ever encountered a nokia 6700 that always display insert SIM card on the display even trying inserting a good and working SIM card but still won't accept any SIM card, this solution may possibly fix the problem.
Repair hints:
a) Ensure that the SIM card socket, slot or holder pins are cleaned and free from dust and oxidation.
b) Trace and check the VSIM voltage, it reads about 1.8 to 2.8 volts on components showed on the solution above.
c) IF the SIM voltage is okay, you may need to remove and rework the GAZOO chip for further trouble shooting.
Warning: handling the GAZOO chip may need extra expertise or you may end up a dead phone. Don't touch it if no adequate knowledge about this chip.
Nokia 6700 classic insert SIM card problem solution
a) Ensure that the SIM card socket, slot or holder pins are cleaned and free from dust and oxidation.
b) Trace and check the VSIM voltage, it reads about 1.8 to 2.8 volts on components showed on the solution above.
c) IF the SIM voltage is okay, you may need to remove and rework the GAZOO chip for further trouble shooting.
Warning: handling the GAZOO chip may need extra expertise or you may end up a dead phone. Don't touch it if no adequate knowledge about this chip.
The improvements and inventions of telephone in history include: toner microphone, manual switchboard, dial pad, automatic telephone switch, program-controlled telephone switch, dual-tone multi-frequency dialing, voice digital sampling, etc. New technologies in recent years include ISDN, DSL, VoIP, analog mobile phones and digital mobile phones.
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