Describes how to use sim900a to send and receive Chinese and English message, how to call and answer, hang up the phone, how to use the gprs.
介绍如何使用sim900a发送接收中文和英文短信，如何拨打电话及接听，挂断电话，如何使用gprs。
youdao
Whistles call and answer.
回荡着口哨的相互呼应声。
This is Call and Answer!
这就是呼号和回应！
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模块上移
模块下移
不移动