Phoebes first power was that of premonition, the ability to see into the future. As Phoebes power developed, she could also see the past and present as well. Now Phoebes power has advanced, and she can actually move around and take part in her premonitions, although this does come at a price as she can now also be injured, or even killed in her premonitions.
Levitation
Phoebe later developed the power of levitation. This allows her to rise up from the ground, and travel in the direction of the momentum of the direction she was already moving in. She cannot however fly, although she did briefly have this power when a genie granted her a wish.
-PAST-LIFE-
Fire Throwing
When Phoebe was pregnant with Coles son, and in her past life when she was evil, she had the power to throw jets of fire from her hands. This power was stong enough to vanquish most demons, although it didn't seem to effect very high level demons such as The Seer.