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The trusted device of Apple's mobile phone has been deleted. How to install it?
IPadiOS9.2 has device management, and the opening method is as follows:

① "Settings"-> "General".

(2) pull up the page, the penultimate line is "equipment management".

③ The top line of "equipment management" is "VPN" and the bottom line is "supervision". Note: In systems above iOS9.0, applications that have not been downloaded and installed through the AppStore or have no authenticated digital signature must first enter "Device Management", click the publisher of the application under "Enterprise Applications" and click "Trust" to open the application.