One problem is where dim people try to be clever, which was behind many of the 087/084 excuses. I have an idea that THA 0808 numbers (Telephone Helplines Association) were still to be properly free from payphones and mobiles, but perhaps that is wishful thinking.
But, of course, a normal geographic number is the answer. With slightly better doubles and patterns (not too fancy) for special numbers.
Or is this to plain and simple? (And time for me to go to bed.)
But not before noting that if people tried to run things properly instead of trying to be clever with 087/084/080 etc - and failing because they did not understand the implications.