Here's a not-as-random-as-it-appears mix of comments/questions: If you don't see a spike yet, you might not get a rebloom this year. People should repot a new orchid as soon as it finishes blooming because most big growers time their re-potting schedules so that the mix lasts just long enough for a bloom cycle to begin.
It's good that you're only watering once a week because more orchids are victimized by over-watering than by underwatering. You might want to push a pencil into the potting mix right before watering again to see how dry it is. Especially this time of year. Phals don't get the same kind of dry ret period as many other orchids, but they need less water in winter.
What kind of pot is it in? Some places sell them in a clay pot, but the plant is actually in a plastic pot inside the clay. Also what is the potting mix? Some hold much more moisture and all do as they break down. Being too dry is better than staying soggy for extended periods of time. You should repot it as soon as you see any sign of new root growth in the spring, unless it has started a flower spike. In that case, be careful about how often you water it and repot after the bloom is finished.
How much sun does the plant get in that window? If it's "vibrant" green, I think it isn't getting enough sun because Phals generally are a paler shade of green. I wouldn't make any changes now, because it sounds healthy, but you might want to put it in a brighter place, if possible, in the spring.
Have you been fertilizing it and, if so, how often and with what. If you have been, stop for the winter. Which reminds me, are you in the northern hemisphere, so that winter is approaching instead of summer?