I might cave in and get an iPhone.

It's $649 unlocked. Ugh. But you have to choose either Sim free or T-Mobile.

So if you choose the T-Mobile (is the T-Mobility hardwired into the phone or something?? ) then you have to then go with the T-Mobile worldwide as discussed above? What if you want something different down the road?

And btw, I assume worldwide does include the U.S., just don't want any surprises, in case it means 'anywhere but'.

What does 'Sim Free' mean? It's the same price. If you get this, what then?

I've managed to live in a cell-less cell, as you've understood by now, so explain it slowly. Plus, I don't feel well when thinking about this so be gentle.