I have an iphone through work. Free. I got an iphone 4 a while ago, it did not have the option for "personal hotspot." anywhere in the settings app. Believe me, I looked long and hard. I got a replacement phone which I was TOLD was a 4s. I assumed it was because i saw the hotspot option right there out in the open in the settings app. So I hear Siri is available on the 4s so I go to see how I can start using that - long story short, it's just a 4 not 4s (number on back). So I'm wondering - Why is this option in this iphone 4 but not my last one? what changed? exact same phone, exact same plan, exact same number. All I did was backup/sync my last phone and copied all that to my new one. Everything from the settings to icon placement was the same but now I have more options... But it's the same phone? Annoyed and frustrated. This makes no sense. How can I tell which phone I have and which options/features are supposed to come with it?