On the island of Hengsha, 60 kilometers north of downtown Shanghai, many older adults rely on a 10-square-meter mobile service office. As the only mobile service office on the island, only one of the staff members works on the day shift, covering all kinds of problems that come out. And the six others take turns to work on duty. Around 30,000 residents live in Hengsha, and about 8,000 of them are customers of China Mobile. The services provided at this office are no different from the company's other offices. Still, the service time for each customer is usually longer as most of the island's residents are senior citizens.