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Why does the app have to run in the background to get Caller ID to work?

Apple restricts what call data 3rd-party apps such as Truecaller can access to provide Caller ID. Because of these limitations, you must keep the app in the background open, and never “kill” the app (by double-tapping the home button and swiping up) in order for the Caller ID feature to work as intended. Please make sure that "Background App Refresh" is enabled by going to iPhone Settings > General > Background App Refresh > Find Truecaller and toggle it on.

Rohit is the author of this solution article.

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