I would say as long as the night temperatures are above about 50 your orchid could go outside for the summer. Be aware that direct sunlight can burn the leaves, so for example filtered shade under a tree is excellent light and the plant will be protected a little from cold temperatures by a tree canopy, too. If you have somewhere like a protected porch or patio with an umbrella or other shade, that might be great, too. The change of climate for the plant might be what it needs to put up a flower spike, too. But do keep an eye on the weather forecast, and rescue it once the night temps fall into the 40's.
Phals are terrible divas and can react to any change in position, so find a good spot for it and leave it. Be sure the leaves are oriented towards the light, though. When you do move it, it might respond by shriveling up or wilting the leaves again. As I said above, this is a common thing and the leaves will most often come back. Lots of people panic when they see this, and think they are killing the plant, but it's just the plant behaving badly.
One more caution, especially if it's going outside - these plants can be prone to crown rot and this is caused by water sitting in the cup of the leaves. So, if your plant is sitting straight up in the pot, you may want to tilt the pot so that any water (like rain!) will run out of the cup, not sit in there. The plant will gradually grow in one direction and eventually slant itself but that can take a long time as Phals are slow growers. In nature, they grow on vertical tree trunks with the leaves hanging down and the flowers cascade also.
Here are some of mine, see how the crowns are not straight up?
