Hello Lilly_M01,
To help with the issues you're having with FaceTime and your keyboard stalling, let's start with some basic steps. First make sure you have Apple's newly released iOS 15.4 version. These updates contain software that is crucial to the operation of your iPhone: Update your iPhone, iPad, or iPod touch - Apple Support
Update your iPhone, iPad, or iPod touch wirelessly
Back up your device using iCloud or your computer.
1. Plug your device into power and connect to the internet with Wi-Fi.
2. Go to Settings > General, then tap Software Update.
3. If you see two software update options available, choose the one that you want to install.
4. Tap Install Now. If you see Download and Install instead, tap it to download the update, enter your passcode, then tap Install Now. If you don't know your passcode, learn what to do.
You might see that your device is up to date and that there's an upgrade available. For example, even if your device is up to date with the latest version of iOS 14, there might be an option to upgrade to iOS 15. You might want to upgrade iOS when you pair an accessory with iPhone.
If there is no change with FaceTime calls, reset your network settings.
1. Go to Settings > General > Transfer or Reset iPhone > Reset > Reset Network Settings. This will erase all current saved settings, including Wi-Fi passwords, preferred networks, and VPN settings.
2. Try to make or receive calls in another location.
To help with your keyboard becoming unresponsive, disable any additional keyboards you may have installed in Settings > General > Keyboard > Keyboards. Next test to see if the keyboard stalls while using different applications, or just a specific one.
Best Regards.
