How to mute the information sound of Cool 4g mobile phone?

How to mute the information sound of Cool 4g mobile phone;

1, open the phone settings.

2. Go in the mobile phone tool.

3. Set the custom SMS sound.

4. Just select Mute.

Coolpad is the mobile phone brand of Yulong Communication Company. Yulong Communication Company, whose full name is "Yulong Computer Communication Technology (Shenzhen) Co., Ltd.", was established in April 1993. It is a wholly-owned subsidiary of Coolpad Group Limited (listed on the main board of Hong Kong, stock code 2369). China is a professional provider of integrated solutions for smart phone terminals, mobile data platform systems and value-added business operations, focusing on integrated wireless data solutions with smart phones as the core, and committed to the development of smart phones.