Fast Follow. Anyone in the US can receive Tweets on their phone even if they haven’t signed up for Twitter. This is a simple way for people to get information they care about in real-time. For example, let’s say you want to get Tweets from New York City’s office of emergency management (@NotifyNYC). Just text ‘follow NotifyNYC’ to 40404 in the US.
Try it out the next time you see a Twitter @username at a restaurant or store, on a billboard or on TV, or if you hear one mentioned on the radio.