well with post-paid you have to sigh a contract and gives a lot of personal infos,so post-paid is soooo expensive because they normally give you a cell that cost like 400 dollars for 50.00 dollars as an offer but the problem is with the contract they will take money for the service and the device.post-paid is you use the service and the you pay,according what you have used.

prepaid you just pay and then you use,you are paying in advanced,so when you buy a phone,you pay the full amount.and you do not sigh for anything.
boost is cheap,because of the type of technology we use,so we dom not have very smart phones ,adn when you activate a phone we do not collect any pernal infos like adress,social security,phone number or anything,so when you do not sigh contract with X company it means no obligation at all,i will write more later