In-Stat has asked thousands of wireless subscribers in the US and Canada if they have more than one mobile phone number. 15% to over 17% responded that they did, indeed, use more than one mobile phone; most had one phone for personal use and one for business; many use a standard cell phone for most voice calls and have a second device (usually a BlackBerry) as their second phone. That means there are 32.7 mln FEWER people in the US who have cell phones than the so-called “penetration rate” suggests. True penetration is closer to 60% and there are over 30 mln potential new wireless subscribers that haven’t been recognized in the past, In-Stat suggests.