1. **Restart your iPhone:** Press and hold the Side button and either volume button until the power off slider appears. Drag the slider to turn off your iPhone. Wait a few seconds, then press and hold the Side button again until you see the Apple logo.
2. **Check for software updates:** Go to Settings > General > Software Update and install any available updates.
3. **Reset your network settings:** Go to Settings > General > Reset > Reset Network Settings. This will erase all saved Wi-Fi passwords, so be sure to have those handy before proceeding.
4. **Clean your iPhone's speaker and microphone:** Use a soft, dry brush or cloth to gently remove any debris that may be blocking the speaker or microphone.
5. **Test the speaker and microphone in different apps:** Make sure the issue isn't limited to a specific app. Try using the speaker and microphone in different apps, such as Phone, FaceTime, and Voice Memos.
6. **Contact Apple Support:** If the issue persists, contact Apple Support for further assistance. You can do this through the Apple Support website or by phone.