What wireless phone frequencies may interfere with WiFi on a MacBook Air?

When I am using my 2.4 Ghz wireless phone, I am unable to get WiFi reception on my MacBook Air running 10.8.4. The problem goes away when I hang up the wireless phone. Further, the problem does not exist with my iPhone 4s or my iPad 2 (both running 6.1.3). I'm assuming there is a conflict between my WiFi reciever on my MacBook Air and my wireless phone. Is there a wireless phone frequency that might be more kind to my MacBook Air?