There are many reasons for a declining birth rate, and to decide that a product made by Apple is the cause of all this is silly.
What smartphones do is allow people to access social media, a big cause of problems. But then again, so do desktops and laptops.
Another social media caused issue is the rise of generalized misandry, and the target of that misandry "checking out"That's the part that is often not spoken of as much, as to dare to mention that not all problems are caused by men will be attacked.
Watch the response to this post.
And massive checkout of men who choose not to enter into relationships can and will have an effect on birth rate. Men might not be loved, but they have a part in putting in the order.
One big effect of social media for men was for them to share their stories. Men who's wives cheated on them, then divorced him, took his assets, got to keep his house because she got custody of the kids, she marries her affair partner, but the ex gets to continue to pay child support. And he gets to watch his children grow up in freeze Frame snippets.
And let's face it, men can be idiots, thinking with their dinkies, but as more men share their stories, one thing becomes very clear. The way to avoid the very likely outcome of relationships and marriage is to not enter into them.
Youtube has become unofficial manosphere headquarters, a natural thing, since many men used Youtube videos to find out how things are done, and watched videos of activities of interest to many men.
When the manosphere stuff started, for a short time, YT tried to crack down on it. But after figuring out who their customers were, they let it run.
To me, it is a little sad that one of the most obvious reasons is being ignored for narrative. We can see it all over the place, almost amusingly when we get faux sympathetic "There is a male loneliness epidemic" uttered by a modern woman, and a man replies "Not really, men have just decided that there is no valid reason to get into a relationship or marry today, and we opt out"
The usual answer is "No, no, you are lonely."
Let's not forget the attacks on the so called "pick me!" women, who are castigated for treating men well.
Or the now popular go to an Asian country to find a wife. American men and the "Passport Bro" phenomenon. I know several men who have taken this route. Philippinas, Chinese, Japanese, Vietnamese, Thai, and Korean.
Not one has divorced, They treat each other like King and Queen. This is not some misogynist fever dream, No one is being dominated. This is real equality, many of these women have careers, some are stay at home. Their choice.
Side note - when you marry a Philippina, you marry into the family - big time. The men I know married to Philippinas have a huge extended family, often living with them, but always nearby.
But yeah, blame it on the iPhone, which is like blaming car keys for auto accidents.