john matarese explains so you don't waste your money. >> reporter: if your smart phone bill is pushingon dollars a month, wouldn't it be nice to have apps to earn you money? we are not talking about work at home scams but real apps that really pay. u.s.a. today listed three smart phone apps bringing in money for a little amount of effort. you don't get rich but they can help you earn a few bucks for q doing pa1>Ñsimple tasks. task rabbit finds people who need a small job done. putting together furniture or walking the dog. it pays $45. second paying app, yard sale, yard sale finds people near you, interested in your unwanted stuff from baby strollers to old refridge rayers. stores will pay you to scan bar codes, check points and shop kick, let you buildup points for gift cards from target, maceys and other stores. why would a store pay you for that? it gets you in to the store. if you come in, you are going to spend at least 20 bucks. >>> now we are getting an idea how much you are going to spend in cash each year to keep your devices charged. according to the lekic power research inst