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Some time ago, we found a case of Contact Service on the Nokia 5510 mobile phone. Usually at this mobile group, contact service damage can be detected from the difference in the IMEI number is visible at the interface DCTx Tools. To fix it we can do to rebuild IMEI reappropriate the IMEI number.

However, after we check the IMEI number was not a problem (on the screen shows the same IMEI number). Next we tried to write back pm and the results remained the same.
After going through several steps of analysis, we finally conclude that the damage to the IC Ccont. Next we replace IC Ccont and mobile phone were recovered. Hopefully this can be an additional knowledge for us in cell phone repair.