What is the advantage of getting an unlocked iPhone?

Do you get speed advantages or do you end up not spending as much money in the long run? I really don't understand. Do most people who get iPhones get the unlocked version? I mean its like 600 dollars lol. Just wondering.

"Unlocked", "locked", "SIM-free" have got to do with the network - meaning the advantages for gettng an unlocked iPhone would be that the iPhone works on any network, other than that, that's probably the only advantage, people pay more to have it unlocked (also called SIM-free) just in case they want to use another SIM, I mean it'd be hassle if you wanted to switch to a different network but you couldn't (because your phone isn't unlocked) right? If you want to spend more on an unlocked one then yeah, unlocked phones are worth it. I'm pretty sure unlocked phones work in other countries as well.

Have a great day.

It could be used on any GSM network you want
Plus it has higher resale value when the time comes to sell.

Unlocked iPhones can be used with any network with a postpaid or pre paid plan, in all countries that have cell phone services. When using one overseas, the only thing you need to get is a sim card for a provider in that country (or set up international roaming), and the correct wall charger (Australia and pacific countries have different wall plugs to the US, and both regions are different again to Western Europe.