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Here, you can choose whether you want to let others find you by your phone number. You can also choose whether to receive Tweets from people you've enabled for mobile notifications, direct messages, mentions and replies. You can also choose to turn updates off during a specific window of time, such as 11 p.m. to 6 a.m. when you're sleeping.

: Text the phrase "set mentions on" to 40404 to activate these notifications. You'll receive a text message anytime someone mentions your name in a tweet.

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