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Difficulty: Very hardMobile Device Hardware and Display Issues

A field technician is troubleshooting hardware and cellular connectivity issues on corporate mobile devices. A smartphone recently had its motherboard replaced due to physical damage. Although the original SIM card was reinserted, the device fails to connect to the cellular network and displays an authorization error. The cellular carrier requires registering the 15-digit unique hardware identifier assigned to the new cellular transceiver radio built into the replacement motherboard. To resolve the cellular registration failure on this repaired device, which of the following is the correct action for the technician to take?

  1. Obtain the device's IMEI (International Mobile Equipment Identity) number and provide it to the carrier to update their hardware authorization database.Answer
  2. B
    Obtain the IMSI (International Mobile Subscriber Identity) number from the SIM card and submit it as the updated physical hardware identifier for the replacement motherboard.
  3. C
    Perform three consecutive 0% to 100% deep discharge cycles on the smartphone's lithium-ion battery to recalibrate power delivery to the cellular modem chip.
  4. D
    Replace the high-voltage display inverter board behind the screen to restore sufficient electrical current to the integrated cellular antenna module.

Answer

Obtain the device's IMEI (International Mobile Equipment Identity) number and provide it to the carrier to update their hardware authorization database.
The correct action is to provide the carrier with the device's International Mobile Equipment Identity (IMEI). The IMEI is a unique 15-digit number hardcoded into the mobile device's cellular modem hardware. When a motherboard is replaced, the embedded cellular radio changes, resulting in a new IMEI that must be registered with the mobile network operator to restore network connectivity.

Step-by-Step Solution

1
Identify the root cause of the network authorization failure following motherboard replacement.
The physical cellular transceiver hardware changed when the motherboard was replaced, altering the hardware serial number recognized by the cellular network operator.
Cellular carriers bind network access privileges to both the subscriber card and the specific physical mobile device hardware identifier.
2
Differentiate between mobile identifiers (IMEI vs. IMSI).
Recognize that IMEI uniquely identifies the mobile hardware device transceiver, whereas IMSI identifies the subscriber account on the SIM card.
Since the SIM card (IMSI) remained unchanged but the motherboard (IMEI) was swapped, the new IMEI must be provisioned with the carrier.
3
Select the correct administrative troubleshooting step.
Retrieve the 15-digit IMEI from the device settings or motherboard assembly and submit it to the mobile operator to update account provisioning.
Updating the carrier records with the new IMEI re-authorizes the replacement transceiver to join the cellular network.

Key Concept

Mobile Hardware Identifiers and Provisioning (IMEI vs. IMSI)
Estimated Time:2m 0s
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Topics

Mobile Device Hardware and Display Issues

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