[maxvolt]

If there no signal it will definately drain the battery as the phone searches for an acceptable beacon... that said I have no damn clue how to disable "phone" in such a situation, but I agree there should be one, so you can just use the PPC pda features. I saw in seeting a phone Icon...but I dont think that does it...u can check it out, i just turned mine off for the night. Also remember programs stay running even after you "X" them when youre using them...you have to use either the "STOP ALL" under running programs or the master program killer on the top right corner of the Today screen to really kill them...if their left on, they will certainly be eating battery, because they are running, especially IE and BLuetooth crap.