I check the media it is in and re-pot out of sphag as soon as I can. Certainly the desire for new root growth is there but with a phal, I re-pot phals with active root growth or not. Sphag is too easy to cause root rot.
I also remove all packing materials. And I check the roots. I also inspect for obvious issues (bugs or disease). I try to keep them away from others if I can for a week or 2.