With cellular airtime, you can pay as you go or enjoy lower airtime rates by signing a contract. An airtime contract is a binding agreement between you and the cellular service provider (such as Altech Supercall Cellular) of your choice. You can choose a contract that lasts for a month, 12 months or 24 months, and you are obliged to pay a set monthly fee for the duration of the contract ... plus any extras. These extras can include things like caller-line identity (which can let you see who’s calling before you decide to answer) and itemised billing (which lists every number you call and the length and cost of each call). Many contracts include a fixed amount of airtime each month, and any unused airtime is carried over to the next month. If you use more than the included airtime, the cost is added to your bill for that month. | 
