Switched from ATT specifically to get this phone. Initially worked fine. With time began dropping calls and not putting calls through even with 4 bars of service. Went to a Sprint store and they told me this is a common problem with this phone and they are working on a software upgrade. Tried to live with it for another week, but when your phone doesn't work for an hour here and there it becomes a problem. Went to another Sprint store and they said they have no idea if or when there will be a fix, in fact the associate never even heard about this being an issue. Anyway the Sprint warehouse was out of stock, so he gave me a Toshiba VM-4050 to use for now. After using both phones I think I will stick with the Toshiba. Bells and whistles are nice, but I have a cell phone so I can use it, not to look cool. At least the Toshiba works all the time, and has most of the features of the Sanyo plus a better screen.