1. A method of purchasing between mobile buyers and sellers, comprising: receiving a micro transaction message from a buyer's wireless communication device, the micro transaction message including buyer information, a product or service identifier, and a micro payment amount, the micro payment amount being a portion of a predetermined total requirement, delivery of the product or service pending receipt of the predetermined total requirement; processing the micro transaction message, wherein processing the micro transaction message includes accumulating the micro payment amount with at least one other micro payment amount to form a total accumulated payment amount; and initiating a billing process when the total accumulated payment amount meets or exceeds the predetermined total requirement.