I did close to the same with my kids.. their PCs were in a common room, they got their first phone at 14 and it stayed at the downstairs charging station at night until 17. IMO it worked great and both our kids have a healthy relationship with their phones and tech in general.
When I say they have a "healthy relationship with tech" it doesn't mean they don't use tech, they both are heavily into tech, but don't let it impact their life adversely. It is more a balance that works for that individual than a preference for real vs. tech.
