Who do the pilots talk to out there? No LA Center, Oskland Center, etc there.
Oakland Center controls much of the North Pacific. Communication is via ARINC (San Fransisco Radio) on HF and, for those aircraft that are equipped, data link. On the other side of the Pacific control transfers to Tokyo Control, Manila Control, Singapore, etc.
Here are some feeds on LiveATC.net of various oceanic HF frequencies.