I hope it works... it's kinda terrifying that getting no scam calls for 2 days is significant!
I have a test/dev phone that I used for a project several years ago with an associated ph#. I forgot about it (don't think about the charges accrued 8^) for several years, but just charged it and turned it on.
It's a number that was never used or answered for 3 years and it gets several scam calls a day. They must be calling every valid number.