[username]" to 40404. (No @ symbol required.) This will let you receive updates from important accounts, but won't let you post. Some suggestions and example for Fast Follows, though yours will be location-specific: @nycgov @wsjweather @fema @twc_hurricane To post to Twitter , follow these instructions from Twitter's FAQ: How to add your phone to your existing Twitter account via SMS: -- Send a text to your Twitter code [40404] with the word START. --  We'll reply and ask you to text YES to the Twitter short code. --  Text your username to the same number. Do not use the @ symbol or quotation marks. Send your username ONLY. For example: larrybird --  Next, text your password. This is case sensitive, so be sure you are sending your password correctly. --  That's it! You're ready to go! Your account can now be used with the whole range of Twitter text commands, found here . A few important ones: ON: turns ALL your authorized Twitter updates and notifications on. OFF: turns ALL phone notifications off. Otherwise, anything you send to 40404 will be posted from your account. (These instructions only work for Verizon, AT&T, and affiliated MVNOs.) Courtesy of BuzzFeed This used to be more functional, but you can still have Facebook forward you notifications and private messages via SMS, as well as post status updates. You can also respond to private messages, which is potentially valuable if you don't have someone's phone number but happen to be Facebook friends. To activate