Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Replacing Phone Module (PHM) With VOLVO On Call
In addition to the software for the Phone Module (PHM) with Volvo On Call function, a unique security code is also downloaded with the software. When replacing the Phone Module (PHM) the security code is retrieved from the Volvo central database. A new Phone Module (PHM) has a generally known security code. The code is used to unlock the control module, and to program functions and to read off parameters. Unlocking is carried out automatically in the ordering version accessible in VIDA.
After software download the read off parameters are transmitted to the Volvo central database. Information about modification to the customer data for Volvo On Call are then transmitted further from the Volvo central database to the web portal that handles customer data for Volvo On Call. The information is also transmitted to the Volvo On Call Service Centre via ftp File Transfer Protocol .
The unique security code is programmed into the Phone Module (PHM) during software download.
The following parameters are read off and transmitted to the Volvo central database:
- GSM number for the subscription.
- Security for your device ( Security access code )
- The PUK code for the internal SIM card for Volvo On Call.
- IMEI (International Mobile Equipment Identity), The GSM device's serial number.
- Version number on the GSM unit software.
- Unit type.
After replacing the Phone Module (PHM) with Volvo On Call function, the service must be activated again if the customer has an active subscription. This does not happen automatically during the order process.
Phone Module (PHM) with Volvo On Call function must also have the correct internal telematic service status for it to be possible to activate the service. For more information about this status, see Vehicle communication information, Phone Module (PHM) : Refer to DESCRIPTION OF PARAMETERS, VEHICLES WITH INFOTAINMENT HEAD UNIT (IHU) .
Instructions and activation code for activating and deactivating Volvo On Call is available on the Volvo On Call website. After activating the Volvo On Call function the Phone Module (PHM) will wait for 0.5-20 minutes for information about the vehicle position. The position is received by the GPS aerial which is directly connected to the Phone Module (PHM). The vehicle must be parked outdoors without any screening objects during this period for the Phone Module (PHM) to obtain contact with the GPS satellites. If the Phone Module (PHM) cannot obtain a position within this time frame the activation sequence will be interrupted. Volvo On Call function will go to deactivated. When the Phone Module (PHM) has obtained the vehicle position the ON CALL button must be held depressed for at least two seconds to connect a call to the Volvo On Call Service Centre. This call is made to confirm modified vehicle data and to check that Volvo On Call functions in the correct way.
Due to the unique safety code and the internal SIM card it is not possible to move the Phone Module (PHM) with the Volvo On Call function between vehicles.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.