Smart Phone Troubleshooting Guide

Possible Cause: 

The trusted credentials disabled or the phone is unable to authenticate secure connections.

Steps:

1. Start by connecting the phone to the internet using Wi‑Fi or mobile data.

2. Go to Settings.

3. Select Security & Privacy.

4. Tap More Security & Privacy.

5. Open Advanced Options.

6. Select Encryption & Credentials.

7. Tap Trusted Credentials.

8. Turn ON all available options.

Possible Cause: 

The Call blocking or harassment filter settings have been enabled.

Steps:

1. Start by opening the Phone (Dialer) app.

2. Tap the Settings icon (top right).

3. Select SIM & Network Settings.

4. Choose Data & Security.

5. Open Harassment Filter.

6. Ensure the following options are OFF:

   • Block numbers not in contacts

   • Block unknown or hidden numbers

7. Review Allowed Numbers and confirm no valid contacts are blocked.

Possible Cause: 

The SIM Card is damaged, dirty SIM Card tray, or software configuration issue.

Steps:

1. Start by powering off the phone.

2. Carefully remove the SIM card.

3. Inspect the SIM for scratches or bends.

4. Clean the SIM Card and tray gently with a dry and soft cloth or brush.

5. Reinsert the SIM correctly.

6. Power on the phone and test network connection.

7. If the above does not work, test the SIM in another phone or insert a different SIM in this phone.

8. Reset network settings and update the OS if needed.

Possible Cause:

 The SMS application data has been corrupted.

Steps:

1. Press and hold the SMS/Messages app.

2. Tap App Info.

3. Select Storage.

4. Tap Clear Cache.

5. Tap Clear Data.

6. Restart the phone.

Possible Cause: 

Incorrect default contact storage location.

Steps:

1. Start by ensuring the phone is connected to the internet.

2. Open the Contacts app.

3. Tap the three vertical dots (top left or right).

4. Select Settings.

5. Tap Manage Contacts.

6. Select Default Storage Location.

7. Choose the available email account.

8. If prompted allow your contacts to sync.

Possible Cause: 

The battery is fully drained, faulty charger, or a system crash.

Steps:

1. Start by checking the charging port for any damage.

2. Clean the port gently with a dry and soft brush.

3. Connect the phone to a known working charger and charge for 30–60 minutes, ensure that the phone is not in use while charging.

4. Turn on the phone and operate as usual, checking  for vibration, LED light, or screen response.

5. If the phone does not turn on try a different charger and cable.

6. Connect the phone to a computer to check if it is detected.

Possible Cause: 

Background apps are constantly running, high brightness, network issues, or battery wear.

Steps:

1. Go to Settings > Battery > Usage.

2. Identify apps using high battery percentage.

3. Force stop or uninstall heavy apps.

4. Reduce screen brightness.

5. Set screen timeout to 30 seconds.

6. Disable GPS, Bluetooth, and Hotspot.

7. Turn on Airplane Mode for 30 minutes.

   • If drain stops, the issue is network-related.

8. Update the Android OS.

Possible Cause:

 Overcharging, heat exposure, or use of non-certified chargers.

Steps:

1. Power off the device and disconnect from charger immediately.

2. Move the device away from heat or direct sunlight. 

3. If a phone case/cover is in use remove the phone from the case/cover.

Do NOT:

• Press the battery

• Puncture the device

• Continue charging

Prevention:

• Use certified chargers

• Avoid overnight charging

• Avoid heat exposure or direct sunlight.

• Use phone case/cover that does not cover phone ports

Possible Cause: 

Volume settings, silent mode, debris in the speaker or earpiece, or software issues.

Steps:

1. Start by pressing Volume Up during audio playback.

2. Go to Settings > Sound.

3. Ensure media and call volumes are above 70%.

4. Disable Silent, Vibrate, and Do Not Disturb modes.

5. Disconnect Bluetooth or wired audio devices.

6. Play music or video.

7. Make a test call and switch between speaker and earpiece.

8. Inspect and gently clean the speaker grille with a dry soft brush.

9. Restart the phone and update the OS.

Possible Cause: 

Dirt blockage, disabled permissions, or hardware fault.

Steps:

1. Locate the microphone hole and clean gently with a dry soft brush.

2. Go to Settings > Privacy > Microphone.

3. Enable microphone access for calling apps.

4. Record a voice note.

5. Make a test call.

6. Restart and update the OS.

Possible Cause: Dirty screen, display settings, or hardware damage.

Steps:

1. Start by cleaning the screen thoroughly and Inspect for physical damage.

2. Check display resolution settings.

3. Disable screen zoom or scaling.

4. Remove any screen protector if it damaged.

5. Restart and update the OS.

Possible Cause: 

Camera app has been disabled or software glitch.

Steps:

1. Go to Settings > Apps > Camera.

2. Ensure the camera app is enabled.

3. Clear cache and data.

4. Restart the phone.

5. Test using a third‑party camera app which can be downloaded from trusted app stores such as Play store.

6. Switch between front and rear cameras.

7. Update the OS.

Possible Cause: 

Corrupt Google services data, low phone storage, or outdated OS.

Steps:

1. Clear cache and data for:

   • Google Play Store

   • Google Play Services

   • Google Services Framework

2. Ensure at least 2–3 GB free storage.

3. Update Android OS and Play Store.

4. Uninstall recently installed or unused apps.