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When it comes to phone apps, be aware of a few things.
First, phones are limited in the types of information they can gather from the environment. The screens are heat sensitive, so they can sense temperature based contact. They can also pick up audio and visual, but that's about it. You're phone may experience electrical interference (as any other device might) such as your battery being drained. Any app that claims to measure anything else (like the one that says it measures "quantum flux") is blowing smoke.
Second, most ghost hunting apps work by being sent randomly generated messages from the host server. Like an automated voicemail message or horse_ebooks on twitter, it's just a computer somewhere sending out randomized information. I've also seen ghost photo apps that are supposed to be extra sensitive to paranormal activity, but what it does is slap a random filter on your photo with some sort of "activity," like orbs, streaks of light, or partial apparitions
Third, if you are ghost hunting, having your smartphone on can actually give you a lot of false positive readings. Smartphones are constantly sending and receiving data so, unless it's on airplane mode, every minute or two your equipment will pick up a spike as your phone connects to transfer data.
I've seen a lot of ghost hunting phone apps, and never one that couldn't be debunked by nothing more than reading the terms of service. If you want to use your phone for ghost hunting, you'd do best by just switching it to airplane mode and using it as a voice recorder and camera.
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