Using this Zefal phone kit is easy. First, install the mount on your bike's stem or handlebars. Make sure it's firmly attached. Then, place your Samsung S8 in the phone case. The case is designed to provide a snug fit. You can lock your phone in either portrait or landscape mode according to your preference. When you encounter bad weather, put on the cover to protect your phone from rain and mud. As for maintenance, keep the case and mount clean by wiping them with a soft cloth. Avoid using harsh chemicals that might damage the materials. If you notice any loose parts, tighten them immediately to ensure a secure fit.