Here's a quick reference guide to common iPhone issues, organized by symptom. Each section links to a detailed guide with step-by-step solutions.
Table of Contents
- Performance Issues
- Battery Issues
- Charging Issues (Slow)
- Won't Charge at All
- Random Restarts
- Black Screen
- Camera Showing Black Screen
- Face ID Not Working
- Forgotten Passcode
- Storage Issues
- App Issues
- Safari Won't Open
- Alarm Not Ringing
- Ringtone Not Ringing
- iPad Keyboard Not Working
- Mobile Data Not Working
- Wi-Fi Issues
- Bluetooth Not Connecting
- Mail Issues
- Messages Not Sending
- Transferring Data to a New iPhone
- Photo Recovery
- Contact Recovery
- Backup
- Spam Calls
- Factory Reset
- Security and Virus Concerns
- Scanning QR Codes
- Recording Phone Calls
Performance Issues
If your iPhone feels slow, unresponsive, or laggy, the cause could range from a simple memory issue to outdated software. A restart is the quickest fix, but there are several other steps worth trying.
How to Fix a Slow iPhone | Troubleshooting by Cause
Battery Issues
If your battery drains faster than expected, it may be caused by specific app behavior, display settings, or battery degradation. Start by checking which apps are using the most power, then adjust your settings accordingly.
How to Fix iPhone Battery Draining Fast | Troubleshooting by Cause
Charging Issues (Slow)
If your iPhone charges slowly or stops charging entirely, the problem is usually the adapter, the cable, or the port itself. The fix is almost always upgrading to a 20W+ USB-C PD adapter, swapping in a fresh MFi-certified cable, or cleaning lint out of the Lightning or USB-C port.
iPhone Charging Slowly? Fix It Fast | Adapter, Cable, and Port Checklist
Won't Charge at All
If your iPhone shows no charging icon when plugged in, refuses to charge over MagSafe, or stops charging because of a liquid alert — the cause is split across hardware (cable, adapter, port lint, water exposure), MagSafe interference (cases, magnetic accessories), and software (battery health, iOS bugs). The linked guide covers swapping cables, port cleaning, force restart, the liquid-detected override, MagSafe case interference, Battery Health checks, and when to seek repair. For "charges but slow," see the slow-charging guide above.
How to Fix an iPhone That Won't Charge | Cable, Adapter, Port Cleaning, and MagSafe Diagnosis
Random Restarts
If your iPhone keeps restarting on its own, the cause falls into three buckets — software (iOS bugs, runaway apps, low storage), battery (degraded health or peak performance throttling), or hardware (overheating, water damage, board issues). Walk through the checklist to isolate the cause before deciding on repair or replacement.
Fix an iPhone That Restarts on Its Own | iOS, Battery, and App Checklist
Black Screen
If your iPhone screen is dark and unresponsive, sound is playing but the display stays off, or the Apple logo appears and then nothing else, the cause is usually a depleted battery, a frozen iOS, or a damaged display. Triage by symptom — let the phone charge for at least 30 minutes, run the model-specific force restart, and only then escalate to Recovery Mode or DFU Mode firmware reinstall before deciding on a repair.
How to Fix an iPhone Black Screen | Force Restart, Charging, and Repair Decisions
Camera Showing Black Screen
If the iPhone Camera app opens but shows nothing — a completely black preview, sound playing but no image, only one of the front or rear cameras affected, or third-party camera apps failing while the stock app works — the cause is usually a setting, a physical obstruction, or a temporary system issue, not a hardware failure. The linked guide walks through MagSafe and lens protector interference, force-quitting the Camera app, restart and force restart, Privacy & Security camera permissions, storage and memory pressure, temperature warnings, and final repair decisions.
How to Fix iPhone Camera Showing a Black Screen | App, Lens, and iOS Diagnosis
Face ID Not Working
If Face ID stops unlocking your iPhone, fails in specific apps (banking, payments), can't authenticate with a mask, or stops working after an iOS update — the cause splits across physical sensor issues, software, and recognition conditions, rarely hardware failure. The linked guide covers cleaning the TrueDepth sensors, the proper distance and angle, "Face ID with a Mask" (iOS 15.4+), reset and re-enrollment, "Set Up an Alternate Appearance" for changing looks, and the warning that third-party screen replacements permanently disable Face ID.
How to Fix iPhone Face ID Not Working | Sensor, Mask, and iOS Diagnosis
Forgotten Passcode
If you forget your iPhone passcode, the only Apple-supported recovery path involves erasing the device and restoring from a backup — there is no way to extract or bypass the code itself. iOS 15.2 and later let you initiate the erase from the iPhone alone once "iPhone Unavailable" appears; older versions or offline devices need Recovery Mode through Mac (Finder) or Windows (iTunes / Apple Devices).
How to Reset a Forgotten iPhone Passcode | iOS 17/18 Recovery Steps
Storage Issues
Running out of storage prevents you from taking photos, downloading apps, and installing updates. Cleaning up media, apps, and caches — along with using cloud services — can reclaim plenty of space.
How to Free Up iPhone Storage | Tips for Recovering Space
App Issues
If an app keeps crashing or won't open, the problem could be an outdated version, corrupted data, or a system-level conflict. Force-quitting, restarting, and updating are usually all you need.
How to Fix iPhone Apps That Keep Crashing or Won't Open
Safari Won't Open
If tapping the Safari icon doesn't launch the app, pages stay blank, only specific sites give "Cannot Open Page," or Safari crashes the moment you open a tab — the cause depends on the symptom. The linked guide isolates by symptom (won't launch / blank / specific site / crashing) and walks through force-quit and restart, switching Wi-Fi and cellular, toggling Airplane Mode, disabling VPN and iCloud Private Relay, "Clear History and Website Data" via the iOS Settings app, disabling content blockers and Safari extensions, JavaScript and Cross-Site Tracking settings, iOS updates, storage capacity checks, and finally Reset Network Settings or Reset All Settings as the deeper resets. iOS 17 / 18 compatible.
How to Fix iPhone Safari Not Opening | Launch Failure, Loading Errors, and Crash Diagnosis
Alarm Not Ringing
If your iPhone alarm fails to wake you up — the screen stays silent, sound plays through AirPods instead of the speaker, or Sleep mode and Focus mode seem to be in the way — the cause is almost always a setting or audio routing issue, not a bug. iPhone alarms are designed to ring even in Silent, Focus, and Do Not Disturb modes. The linked guide walks through Clock app settings, ringtone volume, the Focus / DND / Sleep mode interactions, third-party sleep apps, AirPods/CarPlay routing, and iOS update fixes.
How to Fix iPhone Alarms That Won't Ring | Focus Mode, Sleep Mode, and Volume Diagnosis
Ringtone Not Ringing
If your iPhone's ringtone fails to play for incoming calls — only vibration, certain contacts not ringing, calls routed to AirPods instead of the speaker, or no sound after an iOS update — the cause is almost always a setting or audio routing issue. The linked guide walks through the Ring/Silent switch, the Ringtone and Alerts volume slider, Focus mode call exceptions, AirPods/CarPlay audio routing, per-contact ringtone overrides, Silence Unknown Callers, and iOS update fixes. This is different from alarms — see the alarm article if your Clock app alarm fails to ring.
How to Fix an iPhone Ringtone Not Ringing | Silent Switch, Volume, and Focus Mode Diagnosis
iPad Keyboard Not Working
If your iPad's Magic Keyboard, Smart Keyboard Folio, or Bluetooth keyboard stops responding — paired but not typing, working before an iPadOS update but failing afterward, or only failing in specific apps — the diagnosis depends on the connector type. The linked guide covers On-Screen Keyboard fallback, Smart Connector cleaning, Bluetooth re-pairing, JIS / US layout switching, network settings reset, and repair decisions in priority order. Covers iPadOS 17/18.
How to Fix a Keyboard Not Working on iPad | Magic Keyboard, Smart Keyboard, and Bluetooth Diagnosis
Mobile Data Not Working
If your iPhone shows "No Service" or refuses to use cellular data even when Wi-Fi works, can't catch 5G/4G, fails after a SIM swap or carrier change, or struggles after international travel — the diagnosis depends on your SIM setup (physical, eSIM, dual SIM, or budget MVNO). The linked guide walks through the Airplane Mode reset, SIM tray reseating, eSIM re-download, 4G/5G mode switching, APN profiles for budget carriers, Reset Network Settings, Data Roaming pitfalls, and carrier-side outages. Covers iOS 16/17/18.
How to Fix iPhone Mobile Data Not Working | 4G/5G, SIM, eSIM, and APN Diagnosis
Wi-Fi Issues
When your iPhone won't connect to Wi-Fi, the cause could be on the iPhone, the router, or the internet line itself. Start with the 30-second basics — toggle Wi-Fi, restart the iPhone, restart the router — then work through a symptom-based checklist covering settings resets, DNS changes, Private Wi-Fi Address, and captive portals.
How to Fix an iPhone That Won't Connect to Wi-Fi | Troubleshooting by Symptom
Bluetooth Not Connecting
If your iPhone won't pair with AirPods, can't connect to a car audio system, doesn't show devices in the pairing screen, drops connections after iOS updates, or refuses to auto-connect — the diagnosis varies by device type. The linked guide covers the Bluetooth toggle and Airplane Mode reset, Forget This Device and re-pairing, AirPods reset by model (Pro / 2 / 3 / Max), CarPlay and stored Bluetooth history clearing, network settings reset, 2.4GHz interference, multipoint pitfalls, and final repair decisions.
How to Fix iPhone Not Connecting to Bluetooth | AirPods, Car Audio, and Speaker Diagnosis
Mail Issues
If emails stop arriving, the cause is usually one of three things: incoming server settings, the spam filter on your mail provider, or a full mailbox. Cellular vs. Wi-Fi differences and Push vs. Fetch settings can also delay delivery.
Why iPhone Email Isn't Coming Through | Settings, Spam, and Storage Fixes
Messages Not Sending
If your iPhone messages won't go through — a "!" mark appearing, blue (iMessage) and green (SMS/MMS) bubbles behaving differently, certain contacts unreachable, MMS images failing, or iMessage stuck on "activating" — the cause depends on which channel you're using. The linked guide explains the difference between iMessage (blue, internet-based) and SMS/MMS (green, carrier-based), then walks through network checks, iMessage re-activation, SMS-specific carrier settings, Messages in iCloud sync issues, Reset Network Settings, and iOS update fixes. Covers iOS 16/17/18.
How to Fix iPhone Messages Not Sending | iMessage, SMS, MMS, and LINE Diagnosis
Photo Recovery
Deleted photos are not gone immediately. iOS keeps them in Recently Deleted for 30 days, and iCloud Photos plus device backups offer additional recovery paths. Move quickly, though — the longer you wait, the harder recovery becomes.
How to Recover Deleted Photos on iPhone | Recently Deleted, iCloud, and Backup Methods
Contact Recovery
If contacts vanish from your iPhone, start by checking iCloud sync — toggling it off and back on often restores them instantly. iCloud.com keeps version snapshots up to 30 days back, and iCloud or iTunes/Finder backups cover deeper losses.
How to Recover Lost or Deleted iPhone Contacts | iCloud, Backup, and iTunes
Backup
Backing up your iPhone is essential before a device swap or in case of hardware failure. There are three main methods — iCloud, Mac (Finder), and Windows (Apple Devices / iTunes) — and the best choice depends on your storage capacity and how you use your phone.
How to Back Up Your iPhone | iCloud vs. Mac vs. Windows Comparison
Spam Calls
Spam calls on iPhone keep growing every year — sales pitches, international scam prefixes, automated robocalls. The combination of iPhone's built-in features (Silence Unknown Callers, Focus, block contact), carrier-level blocking, and free apps like Whoscall or Truecaller gets the volume close to zero.
How to Block Spam Calls on iPhone | Built-in Settings and Free Apps
Transferring Data to a New iPhone
When you upgrade to a new iPhone, four migration paths cover almost every case: Quick Start (direct device-to-device transfer), iCloud Backup restore, PC-based restore via Finder (Mac) or Apple Devices (Windows), and Move to iOS for switching from Android. The linked guide compares all four, walks through pre-migration checklists (Apple Watch unpair, iMessage off, encrypted backups), and covers app-specific carry-over for messaging apps, mobile payments, and authenticator apps so nothing gets left behind.
How to Transfer Data to a New iPhone | Quick Start, iCloud, PC, and Move to iOS
Factory Reset
Whether you're selling, trading in, or starting fresh after a chronic problem, factory-resetting an iPhone the right way prevents activation lock surprises for the next owner and ensures your messages, watch pairing, and Apple ID stay clean. The pre-reset checklist (Apple Watch unpair, iMessage off, Find My off, Apple ID sign-out) matters as much as the erase itself.
How to Factory Reset an iPhone | Sign-out Checklist for Selling or Trading In
Security and Virus Concerns
If you're worried that your iPhone has been hijacked by a virus, the answer is usually reassuring: iOS is designed so that real virus infections are extremely rare, and most of the apps marketed as "virus scanners" on the App Store are actually VPNs or password managers. The linked guide covers what to check (unfamiliar apps, configuration profiles, Apple ID activity), how to spot the fake "your iPhone is infected" pop-ups that come from shady websites, and when a paid security app is actually worth it.
How to Check an iPhone for Viruses | Safety Checks, What to Do, and Whether Paid Apps Are Worth It
Scanning QR Codes
You do not need a third-party app to scan QR codes on iPhone — iOS has three different built-in methods (Camera app, Photos with Live Text, and Control Center's Code Scanner) and they all work with no extra setup. The linked guide walks through each method, what to check when a QR code refuses to scan (the Scan QR Codes setting, lighting, lens cleanliness), and the security habits worth building around QR codes.
How to Scan QR Codes on iPhone | Camera, Photos, and Control Center Methods
Recording Phone Calls
iOS 18 finally added a built-in "Call Recording" feature to iPhone, but it's limited to iPhone 15 Pro and later. The linked guide covers the iOS 18 built-in recorder, third-party recording apps (TapeACall, JatApp Call Recorder, IntCall) for older devices, external IC recorders for the highest audio quality, the US one-party vs two-party consent law to know before you record, and transcription tools that turn the recording into searchable text.
How to Record Phone Calls on iPhone | Built-in Feature, Apps, and iOS 18 New Tools
