You can tell where an order got to.
Anything out of the app has a reference, a stamped time and the account attached, so "did that come in?" has an answer. Any distribution workflow solution worth running has to make the handoff visible, and that is the piece a telephone call never provides.
A reference number on anything sent from the app
The buyer gets a confirmation when it lands
Kept by account on one screen
Phone orders stay invisible to this, as they always were