I have silly question and probably someone already asked, but I'll ask it anyway. How I can change battery in my verizon 6600 without loosing all the settings? Like programmed buttons?

I always try turn this device off, but sometimes does not help. Btw this little phone love to turn itself on anyway.

How can I turn it off for good? How do I know, if it is off? When I just push "off button", the screen is off, totally black, but green light in upper right corner is still blinking, and so is blue light in left corner. How to make them stop? If I push and hold "off" button, I only turn off backlight. Any suggestions?