The phone number of System Shield Customer Service is 1877-857-9289. Due to high call volume, the calls made to the System Shield Customer Service may be unavailable. In such case, you can use the customer care portal for issues you are facing with System Shield software to create a new service ticket. Do not use the Online contact us form as the form is only for general information queries. Additional self help is available on the website on how to download/install the software, how to use the System Shield software, etc.