A general rule of thumb is that if your economic model has no value judgements, it's positive economics, and if it does have value judgements it's normative economics, since to tell someone what he ought to do, you first have to judge what is best for him.
A subscriber identity module or subscriber identification module (SIM) is an integrated circuit that is intended to securely store the international mobile subscriber identity (IMSI) number and its related key, which are used to identify and authenticate subscribers on mobile telephony devices (such as mobile phones and computers).
Mint SIM is a 3-in-1 SIM card that includes standard, micro, and nano sizes to fit your phone. What is prepaid wireless? Prepaid wireless service means that you pay for your bill at the beginning of your service instead of getting hit up for money at the end of each month.