Yes, you can let someone else drive, but only if you are present in the car. The person taking the wheel must be at least 25 years old and hold a valid European driving license, or have held a valid European driving license for at least two years. You are also responsible for checking the substitute driver's driving skills.
If a booking is registered in your name, you must always be present in the vehicle while driving.
If you are not traveling in the car yourself, you may never entrust it to someone else, unless that person is registered with cambio as an authorized user under your contract and therefore has his or her own account. In this case, you can ask the call center to transfer your reservation to their name. This can also be done via the cambio app.