Deliberate mistake: To avoid the risk of implicating real, unsuspecting people in all sorts of unsolicited calls, movies can use specific phone numbers owned by the studios, but generally they use specific area codes and/or number ranges that are unassigned. Therefore, many movies feature phone numbers that are 'impossible' by design. It's a fact so well known that it is part of pop-culture, in particular for 555-numbers, which to modern audiences nowadays look as credible as ACME items.
Sammo
6th Mar 2020