Which cell phone provider offers good customer service?

I’ve had Sprint phone service for multiple lines for about 10 years. Of late, I’ve noticed a real decline in customer service. For example, I have phone insurance on my daughter’s phone and it isn’t working properly. They told her she would have to mail the phone in to get it serviced. What happened to “replace the phone with the same or similar kind?” On several occasions, I’ve stopped by the store to look at new phones, or to ask a question about my service. No one seemed interested in helping me, and for my question, they directed me to the web site, which didn’t have the answer to my question. I was told that I needed to purchase a computer with a Windows operating system in order to use all the functionality on my phone.

I am not a happy camper. Are any of the other carriers better? I’m thinking about moving to Verizon and getting iPhones.