Final answer:
The best tool to check device known issues for a Sprint customer is the Sprint Support website, which provides a comprehensive list of known issues for various devices, as well as access to support forums.
Step-by-step explanation:
The best tool to use to check device known issues for a Sprint customer is the Sprint Support website. On the Sprint Support website, you can find a comprehensive list of known issues for various devices.
This includes information on software updates, network coverage issues, and troubleshooting steps.
Additionally, the Sprint Support website also provides access to support forums where you can ask questions and get assistance from other Sprint customers and tech experts.