Can "Center" provide VFR flight following? Whenever I've requested VFR flight following, I've always requested it from So Cal Approach/Departure because I'm usually flying within their reach.  If I'm flying outside the reach of So Cal Approach (out in the desert), can I contact Los Angeles Center for VFR flight following?  If I do this, the frequency for contacting Los Angeles Center doesn't seem to appear on the VFR charts, but is shown on IFR low charts.
Also, does the radar coverage of the various &quot;Centers&quot; cover all of the continental US, or are there remote areas where Center's radar and radio communication can't reach?
Any US radar facility can (and will, workload and coverage permitting) provide VFR Flight Following, whether Approach/Departure or Center.
Look up the airport you are departing or, if already airborne, the nearest airport in your general direction of flight in your A/FD, EFB or (if you’re lucky) glass panel. The App/Dep lines will give you the frequency and name of the facility to call in that area.
The coverage problem is mostly an issue of altitude rather than range. Center radar and radio sites are further apart, so due to terrain and the curvature of the Earth, they may not be able to see/hear you if you’re too low. Typically 3,000 AGL is high enough, but if not, just keep climbing and try again in a few minutes.