Watches Are Convenient
Phones don’t keep you punctual. Watches do.
A wrist watch is the most convenient way to tell the time.
I don’t need a watch because I have a phone, is a common response from a generation who are now questioning the adverse effects of constant cellphone use. Fishing for a cell phone on regular occasions just to check the time looks desperate.
A quick glance towards your wrist is a much classier way to keep tabs on time during a date or a meeting. Not to mention how rude it would seem to your companions if you pulled out your phone during a conversation.
On other occasions where it's advisable to leave the phone concealed – like the beach, a funeral, a wedding, a watch is a much more subtle and convenient way to check time.