Advertise on the phone book and you are stuck with that 24 hours post untill the end of the contract, if not longer (old books) I guess it also matters where you advertise, if your not sure about how it's going to work...don't do it!
Or at least find a place, where they have a 24 hour feature you can turn on and off. If it's ON then when someone needs a electrician for a midnight problem the client needs only to include this into their search requirements and ONLY electricians who service 24 hour will show up in the results. Turn it off and you won't get those calls, then turn it back on and you will. see? on/off on/off on/off on...ok I'll stop, but i do like that.
