I have 3 useless phones.

I have 3 useless phones, and I want them to pay for themselves. Most lockscreen apps are out, the reason being that they pay when you unlock, and those phones I NEVER use.

Id like a passive way to earn, but I dont live in the US, I live in New Zealand (kinda close to Austrailia). The phones are: Samsung Galaxy s5, vodafone smart first (equivalent to the worst samsung android phone, and a very very bad alcatel android phone.

Please help me find apps that are pretty passive ( I can monitor every 6 hours), so I can just do initial setup and wait.

Thanks in Advance!