US Cellular [10-digit phone number]@email.uscc.net
Verizon [10-digit phone number]@vtext.com
Unless you are sending a text message to a number that you do not know the carrier. Also, if you do use this method, the 1XX limit (I think it varies by carrier) still applies. You message might be truncated or send it multiple parts (again depends on the carrier). As far as I know this is the only free way to send a text message.
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为什么不使用电话公司提供的电子邮件地址？
（小样本列表）
除非您要向您不知道运营商的号码发送短信。另外，如果您确实使用此方法，1XX 限制（我认为它因运营商而异）仍然适用。您的消息可能会被截断或发送多个部分（同样取决于运营商）。据我所知，这是发送短信的唯一免费方式。
Why not use the email address provided by the phone company?
(small sample list)
Unless you are sending a text message to a number that you do not know the carrier. Also, if you do use this method, the 1XX limit (I think it varies by carrier) still applies. You message might be truncated or send it multiple parts (again depends on the carrier). As far as I know this is the only free way to send a text message.
您需要支付适当的短信网关订阅费用，这就是为什么免费短信网关上会附加广告，以支付服务费用。
You pay for a propper SMS gateway subscription, thats why there is ads attached to free ones, to cover the cost of the service.