icloud photo sharing
2 phones are sharing the same icloud account with icloud photos on. Let’s say one phone took some pictures, then delete them soon (on the Recentlt Deleted tabs too). Would the 2nd phone have the deleted pics in its camera roll?
If you share an Apple ID/iCloud account on two different phones, whatever you do on the one phone will be reflected on the other phone. If you delete photos on one phone, they will be deleted on the other phone as well.