The texting-while-driving epidemic is starting to get a lot of carrier attention, and T-Mobile's taking it to the next level today by throwing its weight behind a new subscription-based upgrade to the DriveSmart app that's been available on the LG Optimus T since launch. DriveSmart Plus runs $4.99 a month for all lines on your account (provided the lines are attached to compatible devices) and upgrades the basic DriveSmart app by automatically detecting when your car's in motion -- no need to enable it by hand -- at which point incoming calls are automatic
