NEW YORK—Citi, in collaboration with Best Buy®, is introducing the first mobile rewards app to provide a new and convenient way to redeem points from Citi ThankYou(SM) Rewards on your iPhone, iPod touch or Android device. Citi ThankYou members can opt to shop and redeem ThankYou® Points and pick up products within minutes at any Best Buy store, or have products shipped anywhere in the continental U.S. Citi ThankYou members can ....