Bitrad.io is an interesting platform that lets you to earn BRO coins for listening to the radio. The BRO is only generated in this way and cannot be mined with ASICs or PC hardware. It is pretty fair way to earn some coins. This can benefit from the usage of multiple Android or Apple devices. The rate of earning is about 1 BRO/day.
In order to make BRO only sign on and listen to a radio, you must receive Activity Points which are translated to BRO every 60 minutes and are either saved on your profile, waiting for you to access the wallet and customize your payout address and transferred directly to your phone.
You can exchange your BROs for Bitcoins or something else on Crex 24 exchange.

Additionally you can run a masternode for which 2500 BRO are needed to get about 20-30 cents a day. The current price of the coin is about $0.0094.

You won't get rich, but it's money for listening to radio and there are quite a lot different radio stations, from multiple countries. You can even do that in silent mode in order to earn the coins and not actually bother to listen the sound :)