Sprint owns a block of numbers for 816-555-0001 to 816-555-1000. This is for their Network Operations Center in Kansas.
God help you if their system gets your number by mistake, because it will call relentlessly. All their Operations numbers are outbound only, so don't bother calling back to complain. The numbers will only report back as disconnected. Good luck contacting anyone at Sprint, as they will not be able to connect you to that center. At best, add it to your blocked caller list and complain to the FCC.