My wife has this phone and loves it. I do know for a fact that you can put the phone on airplane mode. You just hit one of the icons across the top of the screen. I'm not sure which since it is my wife's, but I have done it myself before.
Alltel really needs to do a better job training their reps. It's frustrating to always seem to know more than the "expert". The really sad part is that I don't know didly or I wouldn't be asking in the first place! (getting down off my soapbox after shooting that rabbit)