Troubleshooting Practice Questions: Mobile Devices

1. A user reports that their iPhone 13 running iOS 16 is draining battery rapidly, going from 100% to 20% within three hours of light use. After checking the battery health in Settings, the technician finds it shows 88% maximum capacity. What should the technician recommend FIRST?
(a) Replace the battery immediately
(b) Check Battery settings to identify apps consuming excessive power
(c) Perform a factory reset to eliminate software issues
(d) Disable all background app refresh features

2. Which mobile device component is responsible for converting analog voice signals into digital data during phone calls?
(a) Digital signal processor
(b) Baseband processor
(c) Graphics processing unit
(d) System on a Chip

3. A corporate employee's Samsung Galaxy S22 is unable to connect to the company's 5 GHz Wi-Fi network, though it connects successfully to the 2.4 GHz network. Other employees' devices connect to both networks without issues. The device shows the 5 GHz network as available but fails authentication. What is the MOST likely cause?
(a) The device does not support 5 GHz Wi-Fi frequencies
(b) Incorrect Wi-Fi password entered for the 5 GHz network
(c) The 5 GHz network is configured for 802.11ac only
(d) The device's Wi-Fi antenna is damaged

4. A technician needs to transfer 45 GB of photos from an iPad Pro to a Windows 10 laptop. The user wants the fastest transfer method that doesn't require internet connectivity. Which method should the technician use?
(a) AirDrop to transfer files wirelessly
(b) USB-C cable connection with iTunes installed
(c) iCloud Photo Library sync
(d) Bluetooth file transfer

5. What is the primary purpose of enabling airplane mode on a mobile device?
(a) To improve battery life during extended storage
(b) To disable all wireless radios simultaneously
(c) To prevent unauthorized access to device data
(d) To optimize device performance during gaming

6. A user's Android 12 smartphone displays the message "Moisture detected in charging port" and refuses to charge via USB-C cable. The device was not exposed to water recently. The user needs to charge the device urgently for an important call. What should the technician recommend FIRST?
(a) Use compressed air to blow out the charging port
(b) Use wireless charging if the device supports it
(c) Insert and remove the charging cable multiple times
(d) Disable the moisture detection feature in developer options

7. A healthcare worker's iPhone 11 running iOS 15 keeps showing "Storage Almost Full" notifications despite having deleted numerous photos and apps. Settings shows "Other" consuming 35 GB of the 64 GB storage. What action will MOST effectively reduce the "Other" storage category?
(a) Clear Safari cache and browsing history
(b) Offload unused apps from Settings
(c) Delete and reinstall messaging apps with large conversation histories
(d) Perform a factory reset and restore from iCloud backup

8. Which mobile device GPS feature allows location tracking to continue functioning even without cellular or Wi-Fi connectivity?
(a) A-GPS (Assisted GPS)
(b) Wi-Fi triangulation
(c) Cell tower triangulation
(d) Native GPS satellite reception

9. A technician is troubleshooting a Google Pixel 6 that intermittently loses cellular connectivity, displaying "Emergency calls only" for several minutes before reconnecting. The device works fine on Wi-Fi, and the SIM card functions properly in another device. The issue occurs in multiple locations with good carrier coverage. What should the technician do NEXT?
(a) Replace the SIM card with a new one
(b) Update the device's carrier settings and PRL
(c) Perform a network settings reset
(d) Replace the device's baseband antenna

10. A retail employee drops their iPad Air from waist height onto a concrete floor. The screen now displays multiple multi-colored vertical lines and responds erratically to touch input in certain areas. The LCD is not cracked externally. Which component MOST likely requires replacement?
(a) LCD panel only
(b) Digitizer only
(c) Digitizer and LCD assembly together
(d) Logic board connection cable

11. Which synchronization method allows mobile device data to be automatically backed up to remote servers without user intervention?
(a) Manual USB sync
(b) Cloud-based auto-sync
(c) Bluetooth tethering
(d) NFC data transfer

12. A user's Samsung Galaxy Note 20 using Android 13 experiences ghost touches where the screen registers taps without physical contact, particularly in the upper-right corner. The issue persists after rebooting and occurs even in safe mode. The screen protector was recently replaced with a third-party tempered glass version. What should the technician recommend FIRST?
(a) Calibrate the touchscreen through Settings
(b) Remove the third-party screen protector
(c) Replace the digitizer assembly
(d) Perform a factory reset

13. A university student's iPhone 14 Pro cannot send or receive iMessages, showing a green bubble instead of blue when texting other iPhone users. Regular SMS messages work fine. The device has cellular data enabled and a stable internet connection. Which setting should the technician verify FIRST?
(a) Cellular data is enabled for Messages app
(b) iMessage is activated in Messages settings
(c) Do Not Disturb mode is disabled
(d) MMS messaging is enabled in carrier settings

14. What is the primary function of gyroscope sensors in modern smartphones?
(a) Detecting device orientation and rotation in three-dimensional space
(b) Measuring atmospheric pressure for altitude detection
(c) Detecting ambient light levels for screen brightness adjustment
(d) Measuring magnetic fields for compass functionality

15. A field technician's rugged Android tablet running Android 11 can connect to the company VPN over cellular data but fails to connect when using public Wi-Fi networks at client sites. The error message states "Connection failed: Network authentication required." Other internet functions work properly on the same public Wi-Fi. What is the MOST likely cause?
(a) The VPN client app needs updating
(b) Public Wi-Fi captive portals block VPN protocols
(c) The tablet's firewall settings block VPN over Wi-Fi
(d) The VPN server only allows cellular connections

16. A user reports their iPad Pro's screen goes black randomly during use, though the device is still powered on as indicated by notification sounds. Pressing the power button brings the display back temporarily. This occurs multiple times daily regardless of which apps are running. What is the MOST likely cause?
(a) Defective ambient light sensor causing erroneous auto-brightness
(b) Auto-Lock timeout set too aggressively
(c) Failing backlight or display cable connection
(d) Low Power Mode activating screen dimming

17. Which mobile device security feature uses biometric data stored in a dedicated secure hardware enclave that never leaves the device?
(a) Cloud-based facial recognition
(b) TouchID or Face ID authentication
(c) PIN code verification
(d) Google Account two-factor authentication

18. A graphic designer's Samsung Galaxy Tab S8 with S Pen stylus experiences significant input lag when drawing in design applications, with strokes appearing 1-2 seconds after pen contact. The tablet is one month old and has 128 GB free storage. Battery is at 75%. Similar lag does not occur with finger touch input. What should the technician check FIRST?
(a) S Pen battery level and charging status
(b) Display refresh rate settings
(c) Whether developer options are limiting background processes
(d) Digitizer calibration in Settings

19. A user's OnePlus 10 Pro displays the notification "SIM card not provisioned MM#2" after inserting a newly purchased prepaid SIM card from their carrier. The device previously worked with their old SIM from the same carrier. What should the user do to resolve this issue?
(a) Clean the SIM card contacts with isopropyl alcohol
(b) Contact the carrier to activate the new SIM card
(c) Reset network settings on the device
(d) Update the device's firmware to the latest version

20. A technician needs to replace the swollen lithium-ion battery in a Google Pixel 5a. During disassembly, the battery appears slightly inflated and warm to touch. Which safety precaution is MOST critical during this repair?
(a) Wear antistatic wrist strap throughout the procedure
(b) Avoid puncturing or bending the swollen battery
(c) Perform the repair in a temperature-controlled room
(d) Disconnect all cables before removing battery adhesive