Here's a solution for nokia 6720 classic with an Insert Sim card problem, this problem occurred if the phone suffered wet or water damaged or just happens and indicates the device is unable or does not detect any SIM card being inserted to it.
If encountered such problem you may just first check and clean the SIM card connector pin for possible damaged, dirt and oxidation build-up. Then refer to the solution below for further troubleshooting procedures.
You may first check the Sim card supply voltage (VSIM) then the ground line pins. The other three corresponding pins such as the DATA,CLOCK and RESET were connected directly to the Power IC chip.
Reheating or reworking the chip might also possibly fix the problem, or replace if necessary.
If encountered such problem you may just first check and clean the SIM card connector pin for possible damaged, dirt and oxidation build-up. Then refer to the solution below for further troubleshooting procedures.
Nokia 6720 Sim Card not Detected Problem Solution
You may first check the Sim card supply voltage (VSIM) then the ground line pins. The other three corresponding pins such as the DATA,CLOCK and RESET were connected directly to the Power IC chip.
Reheating or reworking the chip might also possibly fix the problem, or replace if necessary.
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