I'm curious how my iPhone knows what time zone I am in and change automatically. Does the phone use GPS to figure out where I am in the world? Or is there some other technology in play here.
It uses a combination of GPS and the date/time sent to the iPhone from the cell towers.
There's several questions here about this same topic (different carriers and different iPhones) and they all have very similar responses to what I've said. If you search for this topic, you can see all the different questions and answers; I just combined them all.
It is a SMART PHONE. ( as smart as the person using it. Meaning it has the capacity to do astounding things if you learn how to use it. ) You can use the settings function to set the phone to the time zone you are in and tell it to update automatically or manual. You can set it to a new time zone when you travel.
Settings> general > date and time
if the phone knows what time zone it is in then it know what time it is in that time zone. If you set it to alaska time but you are in new york it will give you the time in alaska ( because you told it is in alaska). If it is set to not set automaticly.