Lee08
Maybe "they" have your phone, because you can't prove it is yours legally.
Just because it was in your pocket at time of detention, does not make it your phone.
If you can't prove its your phone, "they" won't give it back to you.
Cellebrite, thats wishfull thinking on your behalf I think. "They" wont tell you one way or the other if they have tried to breach your phone.