Providing that you give your phone mount the proper care and attention that it needs, and you’re using it properly, then there’s no reason why your phone mount won’t last indefinitely. Make sure you care for it and clean it as per the manufacturer’s guidelines, and don’t put any unnecessary stress on any of the integral parts, and it should be fine. Some mounts are equipped with perishable items that will need to be replaced though. Silicone nets and straps will lose their elasticity and will be pulled out of shape eventually. However, as long as you take care of the product and replace any worn out parts, there’s no reason why your phone mount won’t last forever!