Hello,
There are a number of reasons why a parent might not want their personal telephone details passed on to a commercial third party before those parents have even indicated they want - or even know about - that service.
One reason is that of lack of consent, or the absence of any reasonable expectation that this may occur, which is likely to be unlawful.
I recently received a text message from Parentmail where they could only have obtained my number from my new school. No consent has ever been given for this, nor has the school indicated I should expect my data to be processed in that manner.
Parents cannot be compelled to use ParentMail, and it's clear that very many choose not to have their phone clogged-up with often irrelevant school messages.
I wonder if anyone has any thoughts? I do have a pending ICO referral, because the school should have first sought consent before passing the data on.