Coverage: Network connectivity on the Sprint® Network. HELIO network services are provided on the Nationwide Sprint® Network.* Sprint provides wireless service as the underlying network carrier only. HELIO is responsible to the HELIO subscribers for the service. Please call HELIO with any questions or comments about services. HELIO customers have access to voice and data service reaching more than 279million people. HELIO customers have access to Sprint LTE networks, where applicable by device and location. Sprint 4G LTE network is available in 382 markets, and reaches over 200 million people on select devices. Sprint 3G network reaches over 277 million people.