In some cases, you most definitely can. You must ensure your phone is OEM unlocked, however, or the phone will not allow you to install a new operating system. For those willing and wanting to do the install on their own, www.grapheneos.org has detailed instructions to help you. There are dozens of videos online that will also help walk you through the process. If you have the time and patience to learn how to do this, we recommend you give it a try!