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If the carrier that originally locked your Siemens C25 is defunct and you can't get the unlock code from them, there are a few other options you can try:
Use a third-party unlocking service: There are many online companies that offer unlocking services for mobile phones, including older models like the Siemens C25. You'll need to provide them with your phone's IMEI number and pay a fee for the service, but they can usually unlock your phone within a few days.
Try unlocking the phone yourself: If you're technically inclined, you can try unlocking the phone yourself using software tools and a data cable. There are many guides and tutorials available online that can help you with this process, but be aware that it can be risky and may void your phone's warranty.
Use the phone on a compatible network: If all else fails, you may be able to use the phone on a compatible network even if it is still locked. Check with local carriers in your area to see if they support the Siemens C25 and if they can provide you with a SIM card that will work with the phone.
codes p 0352--353--354 all refer to ignition coils B, C, D--circuit malfunction=== causes --wiring---ignition coil --ECM
codes P0326, 327 ,328 all refer to knock sensor 1, bank 1 range / performance , for 326, --low input for 037 and high input for 0328=== causes --wiring---knock sensor(KS)incorrectly tightened --0326, insecure KS , poor connection, wiring short to ground , incorrectly tightened---ECM and for 0328--wiring short to positive --KS incorrectly tightened---ECM
It seems strange that all these codes appear and unless you have done work on the engine previously to these codes appearing, I would first replace the ECM with a known good unit, remove the codes then run the vehicle again for 15 minutes to see if the codes reappear
Code
Description
C01
Main motor drive error
C04
PFP main motor drive error
C06
LCF feed motor error (DP2000/2500 series)
C13
Cassette 1 error
C14
Cassette 2 error
C15
Cassette 3 error
C16
Cassette 4 error (DP2000/2500 series)
C18
LCF tray error (DP2000/2500 series)
C19
LCF feed motor abnormal (DP2000/2500 series)
C21
Carriage initialization error
C25
Scanner unit watch dog error
C26
Exposure lamp disconnection or peak detection error
C38
Replaced process unit error
C41
Abnormal thermistor or heater disconnection at power ON
C43
Warming up mode after disconnection judgment, or abnormal thermistor after ready
C44
Warming up mode after disconnection judgment, or heater abnormal after ready
C45
Thermistor disconnection at the end part of heater
C56
Communication error between PFC and main unit
C57
Communication error between main unit and IPC (DP2000/2500 series)
Guys....DON@T POST your IMEI!!!! It is a very old device but should be no problem. The thing is unless you don't have unlock code from esat (is it O2 or Vodafone now?) then you have to go to unlock it by cable as this is the only method for c25. It can be done while you wait for few euros.
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