With 5 boys between 10 and 14 (2 sets of twins) when to give children a phone has been a constant conversation. Here is the simple way my wife and I have handled it.
Stage 1 (No Phone): when they will never be somewhere without a trusted adult who has a phone.
Stage 2 (Bark/Gizmo Watch): Call and Text Only for when they will begin to be places without constant adult supervision or will be places for more than one day like Church Camp.
Stage 3 (Bark Phone): After they show they are responsible we moved to a call and text only plan where I control who they can contact and monitor their texting.
Stage 4 (Bark Phone): full access apps I approve and monitoring of their messaging. We are not here yet.
Stage 5 (Apple/Android): they are adults and can pay for their own phone!!!
I use Bark because I use it to monitor their computers so there is only one system to learn.
This plan has helped them learn to use tech responsibility and I did not give them more access then they were ready to handle. When they make mistakes they learn from it or they know I will take it form them until they show me they are ready for it.
You Got This,
Mike