iPhone suddenly sending iMessages to Android phone after years of working correctly
My son moved from an iPhone to an Android years ago. I use an iPhone and have been able to send him texts to his Android for years without any problems. They were delivered as a 'Green bubble' SMS text. Suddenly last week my iPhone started sending texts to him as iMessage, 'Blue Bubble' and indicates they were delivered. But he doesn't receive them. I do have his phone number in my contacts as a 'mobile', not as an iPhone. I do have 'Send as SMS' turned on in my messages settings.
Why on earth is this suddenly a problem?!?!
iPhone SE, iOS 13