He has a social network, contact with counselors who hope to steer him into treatment and the occasional big event to look forward to, such as when the Los Angeles Philharmonic invited him to a rehearsal.
Before you leave the job--or soon thereafter--take a moment to send your boss a quick note or e-mail with your new contact information, mentioning also that you hope you can stay in touch.
Huang Haibo, an executive at China Mobile, stressed the two companies have so far only made preliminary contact, without anything set in stone, yet, but noted they hope to bring the iPhone to China.