In Temple Run 2 on the Android & iOS systems (iPhone, iPad, etc.), you can purchase a Head Start like in the original game, but you purchase it a little bit differently than you did previously.
If you want a Head Start in Temple Run 2, you just need to have at least 2,500 coins collected. Every time you start a game with at least 2,500 coins on hand, the Head Start icon will display at the beginning of your game. Tap it to spend 2,500 coins and jump forward to the 1,000 meter mark.
If you would like a further boost, you also get an option to jump forward 2,500 meters when you have 10,000 coins collected.