I don’t have a kosher phone, and I see nothing wrong with that.
(I do see something wrong with the surrounding circumstances,
but this isn’t the thread for that.)
I lock up all the apps which I can't delete IE: maps.
Why would you lock Maps?
A smartphone is a phone with Internet capability.
That doesn’t sound right to me (I could easily be wrong, though).
Who cares. Just have a normal phone and use it in a kosher way.
You shouldn’t leave yourself the possibility in hand. Also,
there’s the issue of appearing to be part of the smartphone
“culture,” and how it looks to your kids. (Or some such.)