I have a vtech phone. I cannot find any model # on it. Cannot figure out how to open to replace the AA batteries for the caller ID. Any suggestions.

Hope you find a the information on these sites

VTech Manuals (http://www.vtechphones.com/vtechui/support/manual_list.cfm)

http://www.vtechphones.com/vtechui/support/general_more_help.cfm?faqID=23&itemid=0

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If it's cordless, it's on the bottom of the base station.

Suggestion:

Hold it keypad down.
Push down at the seam in the back of the phone and try to slide the cover down in the direction of the charing pins.