Cast a vote for The Voice by voting online, using The Voice App or by voting on iTunes. You can also cast a vote by using text messaging or by calling it in, as of 2015.
To vote for a favorite contestant online, simply visit the official NBC website. Using this method, you can cast a vote up to ten times per performer and per email address. To use The Voice App to cast a vote, begin by downloading the app from either Google Play, the Windows Phone Store or the Apple Store. During live shows, viewers can cast votes right from the start of the show with the app, with the same limit on voting as doing so online has.
Vote for a contestant with iTunes by downloading his "eligible songs" during the voting period. Each individual song download counts as one vote. If a contestant has his song reach the top 10 of iTunes's Top 200 Singles, he gets a bonus that multiplies his iTunes vote for that song by 10. To use text messaging to vote, Sprint customers can text the number "8642" with their favorite contestant's corresponding keyword and/or number. Finally, to use the telephone to vote, simply call the number designated to each contestant.