When I'm talking on the phone with someone, I can barely hear them. The volume seems very low. Are there any fixes for this?

You may have too many background applications running. Fix this by going to your running apps menu and tap on the unneeded applications to close them. If that does not work, try restarting your device by holding down the power button until a window pops up, then tap on restart. If these suggestions do not work, you can take a look at this troubleshooting page for more help.