Both Android and iOS devices are commonly updated through OTA (over the air) cellular or WiFi connections.
However, if you are an early adopter and tempted to jump to the latest versions, you should be prepared for problems. Make sure you have a backup before you begin.
Having a PC or Mac nearby when you perform the update will allow you to reset the device should your update encounter problems.
Also, by checking a popular trusted user forum for posts from early adopters can save you some headaches as any post of failures will be a good warning for you.