"Simon Cowell reveals he hasn't touched his mobile phone in 10 months because it was making him distracted and irritated"
http://www.dailymail.co.uk/news/article-5798903/Simon-Cowell-not-used-mobile-phone-10-months-sell-Britains-Got-Talent-BBC.html
Or maybe he doesn't keep his phone around because he knows certain three letter agencies are listening in?