I have a Verizon Wireless Motorola XT907 that has been laying dormant for a long time, and I recently turned it on again (I'm trying to download an app, and despite the four different phones around my house, this is the only phone it will work on) but I can't get past the unlock screen.

I'll touch the padlock icon, and it will tell me to "swipe to unlock", but when I do that, it will either bring up the phone's camera function, or it will activate the emergency call function.

What am I doing wrong? How can I unlock the stupid thing?