Qq Synchronization Assistant can't synchronize.

First, the mobile phone permissions are set incorrectly.

1, caused by security software. Check whether the mobile phone is equipped with security software, if so:

Tencent Mobile Manager: Please follow the path "Privacy Protection-Privacy Monitoring-Trust Software" to find the QQ synchronization assistant and set "Trust";

360 Mobile Guardian: Click the path "Active Defense-Contact Information/SMS Record/Call Record" to find the QQ synchronization assistant and set "Allow";

Kingsoft Internet Security: Click the path "Advertising Privacy Management-Privacy-Access Address Book/Access SMS Record/Access Call Record", find QQ Synchronization Assistant and set "Allow";

LBE security master: Find QQ synchronization assistant according to the path of "active defense-rights management-privacy-related: SMS record/contact record/call record" and set "Allow";

Other security software: Please go to the security software to open the permissions of QQ Synchronization Assistant, and read contacts, short messages and call records.

2, caused by the system's own authority.

MIUI2. 1 and above systems: Find the QQ synchronization assistant according to the path "Authorization Management-Program" and set "I trust this program";

MIUI4.0 and above systems: Find the QQ synchronization assistant according to the path "Authorization Management-Software Rights Management-Privacy Related: SMS Record/Contact Record/Call Record" and set "I trust this program";

Meizu mobile phone: Go to the path "Settings-Applications-Trusted Programs", find the QQ synchronization assistant, and open "Contact and SMS Reading Permission".