Mobile ad network Mojiva laid claim Thursday to having the ability to serve ad on more than one billion unique devices globally each month. The company said it serves more than 45 billion ad requests in 190 countries and reaches approximately 224 million unique devices monthly in the U.S. In the United Kingdom it serves 33 million; Germany, 10.6 million; France, 5.5 million: Spain, 6.4 million; and Italy, 8.7 million. Research firm eMarketer estimates marketers will spend $2.61 billion in the U.S. on mobile campaigns this year.