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Which folder is the mobile phone certificate in?
Certificates are not used for installation and are not simply placed in any folder. Certificates are used to sign software that needs to be "signed". Certificates are not used directly, but packaged into sis software through a special program. The role of a certificate is only to give the program certain permissions. Don't lose the certificate you got!

Settings-Phone Settings-Applications-Program Management: Software Installation-Select All, Online Certificate Check-Select Close.