However, description files are generally time-limited. Expired description files will affect the normal operation of mobile phones. If you find that the function is abnormal later, you can delete the description file first. Although these files are still in the development stage, they have passed the description file to prove the security of the program, which means that these files have obtained the security certification of the terminal equipment, so they are very safe to use. However, it should be noted that this trust profile is limited in time. If they have expired, it will directly affect the operation of the mobile phone. If there is something wrong with the operation of the mobile phone, you can try to delete these trust files. Usually, after being deleted, the phone will resume normal operation. Such files will not be poisoned during use, but if you accidentally download some rogue software, then these rogue software will make some changes to the system settings of the mobile phone. Be careful with this rogue software.