Q: iPhone 5c iOS10 freezing

Greetings momofnataliebear,

Thanks for posting on the Apple Support Communities. I see that your iPhone is freezing while in the iMessage and Facebook Messenger app while you’re typing. I know that it is important to have a working phone even if you are getting a new phone in the near future. I’ll be more than happy to help. 

First, lets make sure your iPhone is backed up, then we’ll want to force quit those apps and restart your iPhone. It’s always good to give your iPhone a fresh restart every now and then.

How to back up your iPhone, iPad, and iPod touch - Apple Support

Force an app to close on your iPhone, iPad, or iPod touch - Apple Support

Then we’ll want to reset your settings. This will reset all the settings including wallpaper, network, Wi-Fi, and VPN password. It will not reset any of your apps, pictures, or text messages. 

Reset iPhone settings - iPhone

As a last resort you’ll want to reset the device to factory settings to test to see if there is an issue with the content on your iPhone. 

Use iTunes on your Mac or PC to restore your iPhone, iPad, or iPod to factory settings - Apple Support

Take care!