ADD Deployment

I am a frequent traveler and have thus chosen to use my cell phone for contact with ADD when they call to deploy. I do not choose to leave my cell phone on 24/7. I have already had the experience where ADD called and stated, "You have 30 minutes to respond to this deployment request." Needless to say I missed the 30 minute window of opportunity. On the other hand, I am slavishly devoted to email. I would like to recommend dual notification for that one time a year ADD wants me. That would double the chances that I would receive timely notification.