短信群发必备，手机号码格式转换工具，可自定义每行号码个数和分隔符-Essential message group, a mobile phone number format conversion tools can be defined each line number number and the separator

手机短信群发源代码，需要的朋友可以拿去研究一下！-SMS group sending source code

AT指令发送手机短信,AT短信群发,短信发送-AT instruction to send text messages