I did think of that. In the end I really wasn't trying very hard. I left facebook many years ago and I wasn't really keen to rejoin. I found the car I was looking for elsewhere.
Facebook is pretty good at blocking that too. The giveaway is the blurry background, so a bit of photoshopping is required.
and use an online service to create a virt phone number.
They don't allow numbers which are registered to VoIP providers.