Earning halaal

Q: There is a saying written on Pakistani notes (money): رزق حلال کمانا عین عبادت ہے

Is this a hadeeth? Does that mean that one should respect money i.e. not throw it on the floor, etc.?

Phone Contracts

Q: What is the position of a phone contract in Islam? Is it regarded as a sale or ijaarah (hire) as one is buying a phone and also paying for minutes, data, and SMS?

Sometimes, if the person doesn’t use all the minutes, he will lose the remainder and it will not carry over to the next month. Are such contracts permissible?