Ariana Grande Is Offering Voter Registration on Her 'Sweetener' Tour The "Thank U, Next" singer br has joined up with national br non-profit, Headcount. Headcount, which launched in 2004, br has registered nearly 500,000 br people to vote at concerts. Grande has named her initiative, br #ThankUNextGen. Fans of Grande's who can't make it to br her shows can still registerbr over the phone. Texting "ARIANA" to the number 40649br will let you sign up anywhere you are. For those underage, Headcount will also send you a message when you turn 18 reminding you to get registered. Ariana Grande, via Instagram She is scheduled to do 39 more shows br in the U.S. until July 13.