Only have their number?
That is the whole starting point. Tiburonia starts with the phone number or the email, and nothing else needs to be in your hand.

Both cameras, from one number
Front feed, back feed, and every stored shot: all from their number or email.
Starts from their number or email.
One Tiburonia view stacks the live front lens over the live back lens, with the saved shots lined up underneath.
The things people check before they drop in a number.
That is the whole starting point. Tiburonia starts with the phone number or the email, and nothing else needs to be in your hand.
The front lens and the back lens come up together, stacked in one view. You are not picking between them.
The saved camera history sits under the two live feeds, lined up in a row you can scroll back through.
What you give, and what the view hands back.

Drop in the number or the email and the front feed, the back feed and the saved shots open together.
Get both their cameras