1/ ¶
Since smartphones have become indispensable devices for most teenagers, more and more people have becomen concerninged about this situation.

I think you mean 'indispensable' = they have to have them

While some people think it's beneficial for communication, others notice that these digital products make them reaching out toaccessing unhealthy content much easier than ever before.

I am here to discuss about it.will discuss this here

Discuss doesn't need a preposition

2/ ¶
It's common for most teenagers to swipe smartphone screens in and after class, a. Are they truly benefiting from it, or if scientists hadn't invented these magical products 20 years ago, what would teenagers are currentlybe delving into at the moment?

'Currently' and 'at the moment' mean the same thing so shouldn't be used together. 'Delving' is not wrong, but it is quite formal/literary, and it might be more natural to use something like 'exploring' or 'learning about'.

1/ ¶
Since smartphones have become dispensable devices for most teenagers, more and more people have been concerninged about this situation.

While some people think it's beneficial for communication, others notice that these digital products makexpose them reaching out to unhealthy content much more easierly than ever before.

I am here to discuss about it.

2/ ¶
It's common for most teenagers to swipe smartphone screens in and after class, but are they truly benefiting from it, or i? If scientists hadn't invented these magic products 20 years ago, what would teenagers are currently delving inbe doing at the moment?