This situation. Never bought the app in the market.
There are a few phones often change the firmware on them: MIUI, CyanogenMOD, AOKP, etc.
So, I wonder if I buy the app, and then pereproshivka phone — it will stay bought or have to buy again?
Well, fair question... after purchasing the app I can put on all the phones in your account, or for which only bought?