CompTIA A+ Core 2 (220-1202)Software TroubleshootingMedium
A user's Android smartphone can make and receive phone calls and SMS text messages normally, but picture messages (MMS) fail to send or download over cellular data. Wi-Fi calling and internet browsing work fine. Which of the following is the MOST likely cause?
- AIncorrect APN (Access Point Name) settings
- BThe device has exceeded its app permission limits
- CA malware infection on the device
- DA corrupted mobile OS update
Show answer & explanationAnswer & explanation
Correct answer: A. Incorrect APN (Access Point Name) settings
MMS relies on carrier-specific APN settings for its message center (MMSC) address, proxy, and port, separate from general data browsing. Incorrect or missing MMS-related APN settings commonly cause calls/SMS/data to work while MMS fails.
Why the other options are wrong
- B. App permissions control app access to features, not carrier MMS delivery.
- C. Malware typically causes broader symptoms like battery drain or unusual data usage, not isolated MMS failure.
- D. A corrupted OS update would likely cause broader system instability, not just MMS.
APN (Access Point Name) Settings
Carrier-provided settings that configure how a mobile device connects to cellular data networks, including specific parameters for MMS delivery.
- MMS requires separate MMSC, proxy, and port settings within the APN
- Incorrect APN can break MMS while leaving calls/SMS/data working
- Carriers can push correct APN settings automatically or manually
Memory trick: APN = 'Access Point Needed' for pictures to travel