How to make hotspot work on iphone 3gs?

I have TMobile service and own a phone that works well--both Wi-Fi and hotspot--being 4g. I do want to get an iphone but my contract with tmobile is not up for renewal until 2014.So, my friend, who recently got a new iphone, got her 3gs iphone unlocked and gave it to me. I love it but:
1) the bar on top of the screen keeps showing tmobile E…
2) hotspot don't work!
3)when I'm out it starts loses network on and off.
What should I do?

How to use Spotify with Itunes?

I've just downloaded Spotify on my PC. And i've noticed that when you right click the song it says add to Itunes. I thought as soon as i clicked that it would appear on itunes. Because id like to be able to put the song onto my Iphone. Or maybe it means something else lol.
Is there anyway i can save it/transfer it to Itunes to put on my phone. Not sure if you can. But yeh.

Where to buy iPhone charger?

My daughter's iPhone 5 Lightning adaptor is broken. She is going to town tomorrow after school to get a new one if possible but I'm unsure as to where they will be sold.

The phone is on O2
We have an O2 shop, Carphone Warehouse and a Stormfront (Apple reseller). Would any of these places sell these? Also, how much?

Alternative ways to charge iPhone 5?

My daughter's iPhone 5 charger is broken and the only other charger we have to fit this phone is the iPad 4th Gen. Currently, the iPad is on low battery and is being charged. My daughter is going out and I always like her to have her phone charged when she's out. Are there any other ways to charge this phone?

We also have an iPod 4th Gen and iPad 1st Gen but these both require the 8 pin adaptor, and the iPhone requires Lightning.

My daughter's going to town tomorrow after school to get a new charger. Which shops would sell these chargers? We have an O2 shop (phone is on O2) and a Stormfront store (Apple reseller)

Thanks!

Added (1). We also have a Carphone Warehouse

How much more data does the iPhone 5 use than the iPhone 4 & 4S?

I'm considering switching from my old phone to iPhone 5 and I need to know how much more data I would be using. Also if anyone knows how much a month the data would cost for an iPhone 5 that would be helpful. (I use ATT&T)
Also any opinions about iPhone 4S vs iPhone 5 just so I can compare the two

My iphone won't connect to my laptop?

So yesterday I got a new iphone 5, but when I try to plug it into the laptop, nothing happens. However, when I tried plugging my auntie's iPhone into the laptop, it worked! Does anybody know what's going on? We both have an iPhone 5. I don't understand why mine won't connect.