I have seen Sanyo 4900s just go nuts anderase everything ... out--and I live in a "black hole" between very tall brick buildings. The phone doesn't have a camera. It doesn't have a color display.
If you are a sanyo user, this phone is great. The size and weight are very reasonable, especially if you are coming from a 9000 (as I am). So disregard the person who said it was a "brick".