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answer the phone while driving.
.I am like 90% positive that the "slide" motion of the Lockscreen (and subsequent "answer call" screeen) is hardwired in a way that cannot be changed via normal methods. Those screens cannot be "replaced" in the same way your sms, or even dialer apps can.
There is an app that lets you use the camera button to answer the phone, but it really isn't too good and I uninstalled it pretty quick.
BT headset/handsfree, as suggested above, which she should be using if she wants to drive and talk anyway.answer the phone while driving
Lolz, surprised no one replied just to comment on that.