Automatically adding prefix to dialed numbers

I recently moved to a new state with a new 3 digit area code phone#. Instead of dialing the 3 digit code before the local #. i.e 814-777-7777. Is there an app out there that can automatically add say "814" to all numbers I dial without the 3 digit prefix? This very option was available on my Palm 700wx back in the day.

Thanks.