Reserving a Silvercar

• How do I reserve a Silvercar?
• How far in advance do I need to make my reservation?
• Can I book outside of normal operating hours?
• How far in advance of my flight departure time should I book my Silvercar drop-off?
• When I make a reservation it requires me to include my mobile phone number and asks me for my flight information. Why?
• How do I view, modify or cancel a reservation?
• Can I rent a Silvercar on walk-up basis?