US residential spending on mobile phone service in 2007 should surpass the amount spent on landlines for the first time, the AP reports. Government figures say that US households spent an average of $524 on mobile bills in 2006, compared to $542 on landlines and pay phones, and market researchers say mobile spending should come out on top in 2007, thanks to people dropping their landlines and going mobile only. Researchers also note that when business spending is included, mobile spending surpassed fixed lines several years ago.