It all depends on the number. If it has doubles/triples in it, it can change the way I say the number
I do the same. My phone number as a kid had to be said 01234 56 78 90 because the first two numbers after the area code were the same for the whole town and then there was a double.
I can't believe there are people out there who don't know 4 digit area codes exist, there are quite a few of them!