According to Boost Mobile's website, as of August 2014, the number to contact customer service is 1-866-402-7366. Current or prospective customers can also contact support via the form found on the customer service website.
The customer service phone line is available during regular business hours. As of 2014, Boost Mobile's business hours are Monday through Friday from 4 a.m. PST to 8 p.m. PST and from 4 a.m. PST to 7 p.m. PST on Saturdays and Sundays. If the online form is used, customers can expect a response within 12 hours. Customers may get quicker answers to common questions by checking the FAQs list before contacting customer support.