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Difficulty: Very hardMobile Device Wireless and Network Connectivity

A mobility specialist is provisioning a new corporate smartphone on an enterprise Cellular network using a custom access point name (APN). Although the mobile device displays high signal strength and can successfully place standard cellular phone calls, cellular data services fail to initiate. Upon reviewing the mobile device management (MDM) portal logs and carrier provisioning documentation, the specialist discovers that during device registration, the 15-digit physical handset identifier was submitted to the carrier portal in the field reserved for the SIM card's subscriber account identity. Which of the following best explains why cellular data authentication failed on the carrier network?

  1. The carrier network attempted subscriber authentication using the device's physical hardware identifier (IMEI) rather than the SIM card's subscriber account identifier (IMSI).Answer
  2. B
    The carrier network rejected the registration because the International Mobile Subscriber Identity (IMSI) identifies the physical phone hardware while the International Mobile Equipment Identity (IMEI) identifies the SIM card.
  3. C
    The cellular network interface failed to initiate data because the carrier tower was unable to assign an Automatic Private IP Addressing (APIPA) scope address.
  4. D
    Cellular data access was blocked because the mobile mail application was configured to sync over POP3 port 110 instead of IMAP port 993.

Answer

The carrier network attempted subscriber authentication using the device's physical hardware identifier (IMEI) rather than the SIM card's subscriber account identifier (IMSI).
Cellular carriers rely on the International Mobile Subscriber Identity (IMSI), which is stored on the SIM card, to authenticate the subscriber and grant access to data services such as custom enterprise APNs. The International Mobile Equipment Identity (IMEI) is a 15-digit serial number that identifies the physical phone hardware itself. Entering the IMEI into the subscriber registration field causes carrier authentication to fail because the network cannot validate the user's subscriber account profile.

Step-by-Step Solution

1
Analyze the reported technical failure and provisioning error
Voice calls work (circuit-switched/standard network), but APN cellular data authentication fails due to incorrect carrier portal entries.
The portal received a 15-digit physical device identifier instead of the subscriber card identifier.
2
Differentiate mobile identifiers (IMEI vs. IMSI)
IMEI (International Mobile Equipment Identity) uniquely identifies the physical phone hardware. IMSI (International Mobile Subscriber Identity) uniquely identifies the subscriber account on the SIM card.
Carriers authenticate cellular data accounts and provision APN access based on the IMSI tied to the SIM card.
3
Select the option describing the mismatch
Providing the IMEI in place of the IMSI causes carrier authentication to fail because the carrier lookup cannot validate the user's SIM subscription.
Correctly identifying hardware vs. subscriber roles is essential for mobile network provisioning.

Key Concept

IMEI vs. IMSI Cellular Identifiers
Estimated Time:2m 0s
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Topics

Mobile Device Wireless and Network Connectivity

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