Q: why my iphone6 alway hang

Good Morning sabriemily,

Could you provide a little more information about the issue you are having?  I'm going to assume that "hanging" means unresponsive, and provide you with some basic troubleshooting steps for that.

If your iPhone, iPad, or iPod touch doesn‘t respond or won‘t turn on

Your device might have a frozen screen that doesn’t respond when you touch it or press buttons. Or maybe your device begins to turn on, but gets stuck during start up.

If your iPhone, iPad, or iPod touch won’t connect to a Wi-Fi network

Learn what to do if you're having issues connecting to Wi-Fi on your iOS device. 

Update the iOS software on your iPhone, iPad, or iPod touch

Take care,