Perform a hard reset on Motorola C139 from Tracfone

This is my second Motorola C139 phone that has locked up when deleting call history. Removing the battery doesn't help.

Basically, I hit delete all in the call history and the phone never comes back. The screen is blank, no option to access menus. Take battery out, turn on, keypad is lit but no screen display.

Is there a hard reset? I can't tell if it's a port or button, but there is a rubber covering on the back of the phone that looks like it might be a hard reset. Not sure how to activate it though.
The same as described.