Here is a tip for the iPhone that you may already be aware of. If at home, or if you're out-and-about, and you have a weak signal for your mobile phone, here is an article that explains how to use a Wi-Fi network to make a phone call. Most major carriers support this feature. Notice this feature will work whenever you're in an area of a weak mobile signal (and we have a few areas in Prescott like that for AT&T) and have a Wi-Fi signal available that you are able to connect to.
I have had this feature turned on for my iPhone 6 for some time, but have never noticed if I've actually used it. Could be handy sometime, though. If you have an iPhone 5c or newer you might check to see if you have this feature turned on.