Airtime (data transfer and connection) also incurs costs, although a certain amount of airtime might be included in the end user's contract with the carrier.
Airtime (data transfer and connection) also incurs costs, although a certain amount of airtime might be included in the end user's contract with the carrier.
网络连接时间（数据传输和连接）也会引发成本，尽管一定数量的网络连接时间可能包含在最终用户与运营商的合同中。