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I would like to find an iPhone app that is able to show the GSM or WiFi signal strength. Does it exist?

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I don't think that Apple provides any public APIs for interacting with any of the device radios, and would not approve any app that did so with a private API. –  Jason Sep 5 '12 at 21:36
    
@Jason That is correct - you should post it as an answer. –  CajunLuke Sep 5 '12 at 21:51
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up vote 2 down vote accepted

Apple does not provide any public APIs for interacting with any of the device radios, and would not approve any app that did so with a private API.

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