Thousands of phones sold by Jitterbug, a mobile operator that specializes in simple handsets for limited uses such as emergency calls, are being recalled because they can't be used to call 911 in some rare cases. Jitterbug sells bare-bones handsets and no-contract service plans geared toward seniors and other consumers who don't make heavy use of cell phones. One of its phones, the Jitterbug OneTouch, has dedicated buttons for the Jitterbug operator, one preset number, and 911 in place of a n...