LG

i just got this new phone...i have had no problems with it...until now. whenever an incoming call comes through, on the caller id the entire number, including the area code, is displayed. all of the numbers in my contact list do not include the area code. this poses a problem for me because the phone does not match the incoming calls to the numbers in my contact list, as one has the area code and the other doesn't. i'd really hate to have to go through and add the area code to every one of my contacts. i didn't have to do this on my old phone. does anyone have any suggestions? any help would be greatly appreciated.