Don't know when Apple added this, but you can now scan WiFi networks using your iPhone. Previously you had to have Android and use "WiFi Analyzer". Now the free Apple "Airport Utility" app from the app store does this in a useful, although non-graphical, way.
Just get the Airport Utility, and go into its settings. Turn on Wifi Scan there, and you'll find "WiFi Scan" in the upper righthand corner of the initial Airport Utility screen. Just ignore "No Airport Base Station found" message, and tap the blue "WiFi Scan" words. The next screen has a scale on it, which I've ignored. Just tap "Scan" in the upper righthand corner of this screen, and you will see a list of WiFi networks with their channel and RSSI values appear shortly. You can just let this run, and hit "Stop" in the upper righthand corner when you're done.
While it doesn't show things graphically, the WiFi networks that it can see are ranked in terms of signal strength, strongest on the top. I don't know if this was added because Steve Jobs is no longer around to approve/disapprove of every detail that goes into Apple apps, or they finally realized that this is useful to Apple mobile device owners.
Enjoy.
Just get the Airport Utility, and go into its settings. Turn on Wifi Scan there, and you'll find "WiFi Scan" in the upper righthand corner of the initial Airport Utility screen. Just ignore "No Airport Base Station found" message, and tap the blue "WiFi Scan" words. The next screen has a scale on it, which I've ignored. Just tap "Scan" in the upper righthand corner of this screen, and you will see a list of WiFi networks with their channel and RSSI values appear shortly. You can just let this run, and hit "Stop" in the upper righthand corner when you're done.
While it doesn't show things graphically, the WiFi networks that it can see are ranked in terms of signal strength, strongest on the top. I don't know if this was added because Steve Jobs is no longer around to approve/disapprove of every detail that goes into Apple apps, or they finally realized that this is useful to Apple mobile device owners.
Enjoy.