Battery and Performance Issues
Battery draining fast: check battery usage in Settings → Battery (iOS) or Settings → Battery (Android) to identify the top draining app. Common causes: screen brightness high, background app refresh, location services always-on for multiple apps, push email fetching frequently, old or degraded battery. Battery health: iOS Settings → Battery → Battery Health — below 80% = replacement due. Android: varies by manufacturer, third-party apps like AccuBattery measure health.
Device overheating: normal during charging or intensive use (gaming, video). Abnormal: constant heat. Causes: processor-intensive background apps, degraded battery with increased internal resistance, wireless charging on thick case, direct sunlight. Fix: close background apps, remove case during charging, keep out of direct sunlight. If consistently hot at idle — possible software or battery issue.
Slow performance: close background apps (multitasking view). Restart the device (clears RAM, resolves minor software issues). Check available storage — mobile OS performance degrades when storage is nearly full (< 10% free). Update the OS and apps — bug fixes often include performance improvements. Factory reset as last resort for persistent slowness not resolved by other means (back up first).
Screen not responding (touch): clean the screen (moisture or grease affects capacitive touch). Restart the device. Check for cases interfering with the screen edges. Screen protector causing issues (air bubbles, thickness). Physical damage: cracked digitizer — repair required.
Connectivity and App Issues
Wi-Fi connectivity: can't connect — verify password is correct, check if device is getting IP (APIPA/169.254 = DHCP failure). Forget and rejoin the network. Restart the phone and router. Check if other devices connect (isolates phone vs network). 5 GHz band not appearing — device may not support 5 GHz (older devices, or device is too far from AP). Toggle Wi-Fi off/on.
Bluetooth pairing: unable to pair — ensure both devices are in pairing/discoverable mode. Delete existing pairing on both sides and start fresh. Keep devices within 1 meter during initial pairing. Some Bluetooth profiles must be specifically selected. Check for Bluetooth interference (2.4 GHz congestion — microwaves, other Bluetooth devices).
App not working: force close the app (swipe away in multitasking or Settings → Apps → Force Stop). Clear app cache (Settings → Apps → [App] → Storage → Clear Cache — removes temporary data, keeps settings). Clear app data (removes all settings and login — last resort before reinstall). Uninstall and reinstall the app.
No cellular signal: verify device is not in airplane mode. Check coverage map for the carrier in the location. Restart the device (re-registers with network). Try removing and reinserting the SIM card. Check carrier account status — suspended accounts have no service. On eSIM devices, verify eSIM profile is active in Settings.