Rewards and Encouragement

My daughter MIracle is 11 almost 12. She is bugging the crap out of me about getting a cell phone. I am trying to make her understand that a cell phone is a reward and that she can't just ask for it and have me run right out and get it. I told her that if she brings home good grades the first semester of school that i would consider getting one, but she has to understand that she has to keep uo the grade in order to keep it. She thinks that this is not fair and that it will take to lon to get it. She want's instant gradification.How do you explain delayed gratifiction to a 12 year old girl?

Candy has gotten out of control in our house, and with Halloween approaching, I'm sensing some major battles ahead. Yesterday, Aiden woke up and announced "I be a good boy at ni-night, I need treat!" Shocked Ummmm...No?! And all morning he persisted to throw fits and beg for candy. I finally told him that he wouldn't be getting a treat at all.