I have a question my iPhone 5s has been acting up lately I can't use seri and the rear camera shows all black what can I do help!!!!

It means the device is overheated and needs to cool down before use.

Otherwise try restarting your iPhone.

1. Press and hold the Sleep/Wake button until the red slider appears.
2. Drag the slider to turn your device completely off.
3. After the device turns off, press and hold the Sleep/Wake button again until you see the Apple logo.

You see a closed lens or black screen

If you see a closed lens or black screen when you open the Camera app, try these steps:

1. Make sure that there’s nothing blocking the camera lens. If you’re using a case, try removing it.
2. Force the app to close, then open the Camera app again.
3. Restart your device, then open the Camera app again.
4. If your device has a front and rear camera, try both cameras by tapping . If you see the closed lens or black screen on only one camera, take your device to an Apple Retail Store or Authorized Service Providerfor more help.

If Siri isn't available, or doesn't understand or respond to questions

Before you try these steps, make sure that your device works with Siri. After each step, see if Siri is working.

1. Make sure that your iOS device has an Internet connection through Wi-Fi or cellular data.
2. On your iOS device, make sure that Siri is turned on under Settings > General > Siri.
3. Restart your iPhone, iPad, or iPod touch.
4. On your iOS device, go to Settings > General > Siri and turn off Siri. Then turn it on again.
5. If you're using an iOS device, try to use Siri with a headset. If Siri only works when you're using a headset, get help with the microphones on your device.
6. Contact Apple Support.

If Siri doesn't make a sound when you hold down the Home button

On your iPad or iPod touch, Siri will chime when it's time to ask a question. If you have an iPhone with iOS 9 or later, Siri will vibrate instead. You'll only hear the chime on your iPhone with iOS 9 or later when you're using headphones.

Siri will also chime when you use "Hey Siri" on a device with iOS 9.