As I understand Pathfinder cosmology while the Astral plane (and therefore teleportation effects) is available everywhere, the ethereal and shadow planes are only in the inner sphere, intersecting with only themselves, the material plane, the first world, the elemental planes, and the positive/negative energy planes. (And I'm not sure about allof those.)
RAW, I think this means that you shouldn't be able to use any effect that depends on these planes if you're on an outer plane. No Ethereal Jaunt on the Abyss (poor succubus), no Shadow spells in Hell (poor illusionists and shadowdancers), no spiritualist phantoms manifesting in Heaven.
Am I wrong about this? Am I right but everyone just ignores it?
I know Planescape had explicit rules about this, but I dunno if Pathfinder does.
What were the Planescape rules?
If I remember correctly, newly dead souls travel to their resting plane by way of the ethereal, so that at least must extend to the outer planes.
That is the astral plane.
Astral Plane: A silvery void that connects the Material and Inner Planes to the Outer Planes, the astral plane is the medium through which the souls of the departed travel to the afterlife. A traveler in the Astral Plane sees the plane as a vast empty void periodically dotted with tiny motes of physical reality calved off of the countless planes it overlaps. Powerful spellcasters utilize the Astral Plane for a tiny fraction of a second when they teleport, or they can use it to travel between planes with spells like astral projection.
The ethereal plane coexists with the material and shadow planes, but not the outer planes. The astral plane is the only plane that touches everywhere.
PS rules were that the astral plane connected to all outer planes and the prime material, while the ethereal plane connected to the inner planes and the prime material. This meant teleporting was ok on the outer planes and becomng ethereal was ok on the inner.