The Vermont House has passed and sent to the Senate a bill to ban the use of handheld cellphones and other electronic devices while driving. The measure received final House passage Friday after two amendments were added. One would allow the use of the devices while operating a farm truck or other farm machinery. The other would allow use of hands-free devices by drivers if the devices are in a cradle or otherwise secured in the vehicle. The bill faces uncertain prospects in the Senate. Governor Peter Shumlin said he is cool to the idea, but has stopped short of a veto threat.