Yes I have one contact with Home Cell & Work #'s in it. When she calls me on her cell the caller id says HOME not her cell. The number is correct but location is wrong
Mevande's suggestion is likely correct, but if the numbers are in the correct fields, another question to ask is: do you have another entry in your Contacts database with the same number as your wife's cell? If you have more than one entry for a given number, the CallerID function will return the first one in alphabetical order.
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Do you have your address book filtered? If so, you could have a second, invisible entry for your wife that's being matched by the CallerID function. In the Address Book, press Menu / Filter and uncheck any boxes. Then look to see if you have another entry for your wife.
Have you rebooted your phone since noticing the problem? If you haven't, remove the battery with the phone on, leave it out a few seconds, then put it back. That will reboot it. See if that fixes the problem.
Do you sync your address book with a PIM, such as Outlook? If you do, are the entries correct in Outlook? Is the problem only with your wife's entry, or do other entries have the same problem? If the problem is only with your wife's entry, delete it, have her call your phone to make sure it's deleted, then reenter it. See if that solves your problem.