Does anyone know of an app that can test what frequencies are being used in the area? I'm trying to figure out if something is interfering with my wireless router, and if so what it is. I've got "WiFi analyzer", but that doesn't show anything other than wireless signals directly from routers, even though a cordless phone runs on the same basic frequency. In other words, I'd like to find an app that shows what frequencies are present near my phone, including what my phone is putting out. Is that possible?