I've been with ATT since cell phones got small enough to carry in a pocket.
Would I switch? In the blink of an eye! Except my 40+ daughter is a social media junky and requires the smart phone.
The biggest complaint I have is the DATA plan requirement. $30 a month minimum plan and if using Wi-Fi only 0 data plan is used. So data plan is not necessary, but we have to pay it anyway. Highway robbery!
My and my wife have cheap phones that make and receive calls. Is it really necessary that it do more? If I need/want to surf the net I fire up the old desk top or lap if traveling.