Contact Sprint customer service for cellphone problems by calling 844-665-6327 or by using the live chat feature on the company website at Sprint.com, as of 2015. You can access live chat from the home page by clicking on More, and then clicking on Contact Us.
Click on the Live Chat button that is located under the Personal Wireless heading. The online chat feature is available Monday through Friday, 6 a.m. to 11:30 p.m and Saturdays and Sundays from 7 a.m. to 11 p.m., as of 2015.
If you want to contact Sprint customer service by phone when having cellphone issues, the Sprint website requests that you make the call from another phone.