About Caller ID on ios software development

New to ios development, online search the following information, to the conclusion that only jailbreak the phone in order to use Caller ID software. My question is this type of software is because permissions problem or other reasons can not be installed on the phone without jailbreak
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The phone can not jailbreak Apple's official website software installed, you can not just install the software
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Apple seems to use private api, so I can not shelves at appstore, naturally did not escape the phone will not be installed
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Just search for the next turn, for some enterprise applications, developers can purchase a certificate and app deployed on their company's server, and then install the wireless download, this case does not require application developed in appstore shelves, Apple does not need to accept the audit, is not to be used for development of the private api?
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Really need to deploy