I think its worth to mine using what you already have. Like if you just got a phone upgrade or bought a new phone cause you needed to, then that means you have an extra phone laying around. It certainly is not worth to buy a new phone to do so. I thought it would be fun to show and make a video on how to mine this way if one is too be on a super budget and doesn't want to put up any money to get altcoins. Bytecoin is just easy to mine. In 3 weeks (not consistently) I mined 650 Bytecoin with (1 quadcore laptop, 2 quadcore smartphone, 1 toss away single core smartphone) LOL, honestly I don't know of anyone else who does it like this. 650 Bytecoin is equivalent to $0.90. Keep in mind that people pay for hashing power. Meaning they go to Genesis mining or Hashing and pay to lease equipment to mine for them, with time they will make ROI over the short term, however I don't agree with this method even though it is a very popular way to do it and there is a referral system for it and people will go back and forth with their discount codes...