初级帐户有20条免费短信提醒，商务帐户有200条免费短信提醒。

The basic account also comes with 20 free SMS alerts, while business account users can receive up to 200 alerts by text message.

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免费服务还包括每月20条短信提醒，考虑到用户可能想即时查看网站或服务器的下线时间，这项业务还是很划算的。

This free account also comes with up to 20 SMS alerts per months, which is a nice perk, given that you probably want to know that your site or server is down as soon as possible.

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巧合的是，在这个周一，英国移动运营商O2宣布，他们已经与Twitter达成协议，允许用户免费接收t witter的短信提醒。

Coincidentally, UK mobile operator O2 said Monday that it has forged an agreement with Twitter allowing users to receive free SMS alerts from Twitter.

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