I can do this by [details of wildly unsupported technique removed]. Will Apple allow me to submit app to Appstore as there is no public api to get signal strength.?
What you propose is completely unsupported and not appropriate for an App Store app.
At this point in time, 7 years into the evolution of the iOS SDK, I think it’s safe to assume that the lack of an API to get the cellular signal strength is not an accidental omission but rather a deliberate policy decision. Attempting to hack around this restriction will not end well.
In fact, this thread is a perfect example of how such hacks typically pan out: the unsupported approach described by nissolution in their original question stopped working in iOS 8.3 due to sandbox hardening.
Share and Enjoy
—
Quinn "The Eskimo!"
Apple Developer Relations, Developer Technical Support, Core OS/Hardware
let myEmail = "eskimo" + "1" + "@apple.com"