Ask HN: Why the Hell Would You Validate an Area Code?

Area codes get added in the US. Why do so many computer systems reject area codes that it thinks don’t exist? What is possibly the advantage to guessing that the user might have typed their own phone number wrong vs the possibility that you actually don’t know what all of the area codes are? /rant

I am the proud owner of 1 year old area code phone number and I am routinely locked out of text and phone systems. I just found out a major delivery has been waiting for me to set up a time for two weeks because their automated call system can’t contact me and just logs it as didn’t answer.