(Telecompaper) US mobile service providers increased their annual network investments from USD 25.3 billion in 2011 to USD 30.1 billion in 2012, up 19 percent, according to industry group CTIA-The Wireless Association. The USD 30.1 billion is the highest amount since the survey began in 1985 and is approximately 25 percent of the world's total wireless capital expenditures, even though the US has only five percent of the world's mobile users. The US mobile operators invested approximately USD 94 per subscriber, compared with USD 16 per subscriber for the rest of the world. Since 2000, mobile providers invested more than USD 296 billion, not including the more than USD 35 billion in spectrum auction revenues paid to the US government. At year-end 2012, mobile subscriber connections reached 326.4 million, up from 315.9 million in 2011. Data traffic totalled 1.468 trillion megabytes last year, up 69.3 percent from 866.8 billion in 2011. Active smartphones and wireless-enabled PDAs reached 151.1 million, up 36.4 percent. Minutes of Use (MOU) were 2.2999 trillion, up 0.2 percent from 2.2955 trillion. SMS sent and received totalled 2.19 trillion, down 4.9 percent from 2.3 trillion. MMS sent and received reached 74.5 billion, up 41 percent from 52.8 billion.