IPhone 3GS Has Personal Hotspot?

My father bought me an iPhone 3GS. I saw my sister is sharing her internet called personal hotspot. Is iPhone 3GS has Personal Hotspot and how to activate it?

Why won't my iphone charge or switch on?

I recently went on vacation to New York and bought myself an iphone while i was there. It was working perfectly fine but when i got back home (South Africa) it wouldn't even turn on or charge. What could the problem be?

How to travel to Europe with my iphone?

I'm going to be traveling for several months to Europe from the US and will mostly be based in the UK and I want to take my iPhone 5s with me.

I was thinking I could buy a SIM card thru Vodafone and use that while out there but would it work while I'm in other countries in Europe and would it give me a number that I could be contacted thru?

Also, would I be able to text and call people from to the US? And when I come back, will I still be able to keep my same US number?

Any advice on this would be great as it's my first time traveling abroad and want to be able to have access to my phone in the cheapest way possible!

Some info about my phone:

It's an iphone 5s and It was purchased at the apple store and the carrier I use is verizon.

Has anyone ever head of the zombies, run! App?

This app has amazing reviews and I really want to get it… It basically just tracks your runs but there's a storing to go along with it. I really want to get it but I don't know if I can use it with my iPod touch 5th gen. It says you can get it with the iPod 5th gen but I don't know if it will still work the same way… Will any run apps track my runs or something like that or so I need an iPhone? If this makes any sense.

How to increase the Call Volume on an iPhone 5C?

I don't have a screen protector over the speaker, and it has been cleaned repeatedly. The volume is on Max, and still the volume of the call I'd irritatingly low. I'm talking about the speaker on the top of the phone, above the screen.