Mobile devices outnumber traditional PCs in most organisations. A modern technician spends real time on iPhones, Android phones, iPads, Surface tablets, and Chromebooks. This lesson gives you the working knowledge to support them.
Form Factors
| Device class | Notes |
|---|---|
| Smartphone | iPhone (iOS), Android phones (Samsung, Pixel, OnePlus, etc.) |
| Tablet | iPad (iPadOS), Android tablets, Surface (Windows) |
| 2-in-1 / Convertible | Detachable or 360° hinge laptops |
| E-reader | Kindle, Kobo — Linux-derived but closed |
| Wearable | Apple Watch (watchOS), Wear OS, Fitbit |
| VR / AR headset | Apple Vision Pro (visionOS), Meta Quest (Android-based), HoloLens |
Mobile Hardware Differences
Unlike a desktop, almost everything is integrated and non-user-serviceable:
- SoC (System-on-Chip): CPU + GPU + memory controller + neural engine + cellular modem + ISP on a single chip. Examples: Apple A18, Apple M-series for tablets, Qualcomm Snapdragon, MediaTek Dimensity, Samsung Exynos, Google Tensor.
- RAM and storage are soldered to the board — no upgrades.
- Battery is lithium-ion / lithium-polymer; rated in mAh; degrades over ~500-1000 full charge cycles.
- Display is typically OLED on flagships, LCD on budget. Touch digitiser is laminated to the panel.
- Cellular radios: 4G LTE, 5G Sub-6, 5G mmWave (US carrier-specific).
- Wireless: Wi-Fi 6 / 6E / 7, Bluetooth 5.x, UWB (for ultra-precise positioning).
- Sensors: Accelerometer, gyroscope, magnetometer, ambient light, proximity, barometric pressure, GPS / GLONASS / Galileo / BeiDou.
- Biometric: Fingerprint reader, face recognition (Apple Face ID uses structured-light depth; Android typically 2D + liveness).
Ports and Connectors
- USB-C: Now standard on iPhone 15+, Android, iPads, laptops. Supports power delivery, data, DisplayPort alt-mode.
- Lightning: Older iPhones (still in service for years).
- Wireless charging: Qi standard; Qi2 (MagSafe-compatible).
- NFC: Contactless payment (Apple Pay, Google Pay), pairing.
Mobile Operating Systems
iOS / iPadOS
- Apple-only; tightly integrated with hardware
- App distribution: App Store (and EU sideloading post-DMA)
- Updates pushed directly by Apple — extremely high adoption within weeks
- Sandbox model isolates apps; permissions for camera, mic, location, contacts
- iCloud syncs photos, messages, files, Safari tabs, passwords, settings across Apple devices
Android
- Open-source AOSP base, customised by each OEM (Samsung One UI, Pixel stock, etc.)
- App distribution: Google Play, OEM stores, sideload APKs
- Updates fragmented — Google issues security patches monthly; OEMs roll them out variably. Pixel and Samsung now offer 7 years of updates on flagships.
- Google Account syncs contacts, calendar, photos (Google Photos), Drive files
Windows on tablets
- Surface devices run full Windows 11/12
- Same management, security, and software as a Windows laptop
Chrome OS / ChromeOS Flex
- Linux-based; Chrome browser + web apps + Android app support
- Common in education; central management via Google Admin Console
- ChromeOS Flex lets you turn old hardware into a managed Chromebook
Synchronisation and Backup
Mobile users expect data to follow them across devices. Three ecosystems dominate:
| Ecosystem | What syncs |
|---|---|
| Apple iCloud | Photos, mail, contacts, calendar, files, passwords (Keychain), iMessage, Safari, app data |
| Photos, Gmail, contacts, calendar, Drive, Chrome, passwords, Android backup | |
| Microsoft 365 | Outlook (email/contacts/calendar), OneDrive, Edge, Teams |
Backup options: iCloud Backup (iOS), Google One backup (Android), iTunes/Finder local backup (iOS), USB transfer to PC.
Mobile Device Management (MDM)
For businesses, MDM lets IT enforce settings and security across phones, tablets, and laptops:
- Microsoft Intune: Cross-platform (Windows, iOS, Android, macOS); the default for M365 shops
- Jamf: Mac/iOS specialist; common where Apple is dominant
- Kandji, Mosyle, Addigy: Apple-focused alternatives
- VMware Workspace ONE, IBM MaaS360: Cross-platform enterprise
- Google Endpoint Management: Android + ChromeOS
What MDM enforces:
- Required passcode / biometric
- Device encryption
- App allow / block lists
- VPN configurations and certificates
- Wi-Fi profiles
- Email/calendar configuration
- Remote lock and wipe
- Compliance reporting (OS version, jailbreak/root detection)
BYOD vs Corporate-Owned
| Model | Description |
|---|---|
| COBO (Corporate-Owned Business Only) | Locked-down kiosk; employer dictates all use |
| COPE (Corporate-Owned Personally Enabled) | Employer-issued; personal use permitted |
| BYOD (Bring Your Own Device) | Employee device; employer enforces app-level controls only |
| CYOD (Choose Your Own Device) | Employer pays from approved list |
BYOD usually uses "app protection policies" (Intune App Protection / iOS Managed App) that wrap corporate apps without managing the whole device.
Common Troubleshooting
| Symptom | First steps |
|---|---|
| Battery drains fast | Check Battery Health; identify high-drain apps; disable background refresh; degrade if <80% capacity |
| Won't charge | Try different cable + charger; inspect port for lint; force restart; if liquid, dry & do not charge |
| Slow performance | Free storage; restart; check for OS updates; close runaway apps; factory reset as last resort |
| Won't connect to Wi-Fi | Toggle Wi-Fi/airplane mode; forget & rejoin network; restart router; check for captive portal |
| Cellular has no signal | Toggle airplane mode; check carrier; reseat / clean SIM; reset network settings |
| App keeps crashing | Force close; clear cache (Android); reinstall app; check for OS or app update |
| Touchscreen unresponsive | Clean screen; remove case/protector; force restart; check for moisture damage |
| Lost / stolen | Use Find My iPhone / Find My Device; remote lock; if confirmed stolen, remote wipe |
Repair Realities
Most components are not user-serviceable. Common professional repairs:
- Battery replacement (high-volume; manufacturers and 3rd-party shops offer it)
- Screen replacement (most common physical repair)
- Charging port
- Camera modules
Right-to-repair laws are gradually mandating parts and manuals — Apple Self Service Repair, Samsung Self Repair, Google Pixel parts via iFixit are recent examples.
Now that hardware and OSes (desktop and mobile) are covered, the next lesson connects them — networking.