Thinking about jumping ship as it costs me $375 to get the iPhone 4S win sprint rather then $468 wih AT&T. Any other ATT people considering this? I wi probably trial it on the sprint network first as I'm not sure how there coverage is, but I'm getting sick of ATT and the dropped calls (3-4 a day). Any sprint customers here that can share insight about cell service, customer service, etc? Not looking for websites, I want user data.