IPhone 4 doesn't find Wi-Fi networks

When I search for available Wi-Fi networks, my iPhone 4 (on iOS 7.1.2) fails to find networks that my iPad Mini finds immediately.  e.g. in the office today, the iPad finds 7 networks whilst the iPhone finds none.  Both devices appear to have the same settings.
If I switch off the phone and switch it on again, it will occasionally find networks that I have connected to before (home, friends, etc) but that isn't reliable enough.
I have previously tried resetting Network Settings but that didn't help.  
I work away from home during the week, so this leaves me relying heavily on 3G data. I have often have app store updates that are weeks old and downloading music or books is a pipedream.

This is what finally worked for me: launch Airport Utility, select your base station and check to see if the Radio Mode is set to 802.11n (only). If so, try changing it to 802.11n (802.11b/g compatible), and see if your iPhone detects your network after the base station restarts.

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