I've had Sprint PCS for a couple of years now. My first phone was great, but it was big, so I switched to another phone, and it was a piece of shit. I found out after I changed that all Sprint phones will not receive a signal equally, despite what the sales reps will tell you.
I have a buddy who works for PCS, and he looks at the signal strength reports for me, so I know which phone to get. His recommendation to me was Samsung, Sanyo, or LG, and stay away from Kyocera.
Tips for dealing with PCS:
(1) Activate your phone online. It's cheap (or free, sometimes) and can be done in about 5 mins vs. the aggravation of doing it over the phone or in a store.
(2) If you have to call customer service, and you get Claire, yell and scream obscenities. Supposedly that gets you to a live person faster. I haven't tried that, but it's what I've been told.
I just switched to a Samsung flip phone, and it works great. No more dropped calls.