Changes have been made to this app since I posted my link, however this is still the best app for earning PHT. You have to reach level 5 to access the card trading/ selling market. This doesn't take too long to acheive. It's not worth completing collections as the rewards aren't very high. Any red or gold cards you get, sell them. Gold cards can be worth up to around 9000 PHT which is more than double the reward for completing a collection.

Just a note. Anyone saying you will get more from their refferal link isn't being honest with you. The reward is the same regardless of the link you use. Not saying you have to use my link, although I'd appreciate it. I'd just stick to one saying 200PHT & 200XP as that's the deal. I would personally avoid the ones that are lying to you for personal gain.