How to get out of my t mobile contract?

I recently bought a iPhone 5 from apple and bought it handset only, however after I bought it I realised that the company my network was with did not have nano sims yet so to see if my iPhone was working I decided to change network to t mobile and got a nano sim with them I did not set up a direct debit or anything… Jus had the sim from them based on a 12 month contract for £10 a month however I didn't really like there network service so after a month was up, my old network company had nano sims and I went back with them. However I didn't pay t mobile for the month as I didn't want to remain with and went back. I also thought that if I don't pay they will cut my line off which was ok. However I now received a letter saying because I didn't pay my line will be discontinued and my details will be passed on to debt collection agency and credit reference agencies which may affect my ability to obtain a mortgage in the future etc I just wanted to know what is the best way to put a end to this contract shall I phone t mobile and say I want to cancel but then they will probably charge me a cancelation fee etc… What's the best way to get rid off this…

IPhone/android game development?

So I want to make either an android or iPhone 2d game like the diplomacy board game…
Also I want to be able to have players join have the game play through the Internet…
I know HTML and php and JavaScript and a tiny bit of java… Any tutorials recommendations?
Also I have windows which might be a problem for iPhone apps I think…

How to disable the lockscreen pin code using cydia?

Is there a way to disable the locks screen pin code on an iPhone using Cydia so that when I use Stride (another way to unlock your device) it overrides the pin code. Basically I want Cleverpin but all the time, not just on certain networks. The reason I don't disable the code all together is so people can't get in my phone using safemode.
Cheers.

VERIZON iPhone 5 setting up?

I got an iPhone yesterday, but there was a little mix up since we added a new line to get 4 smartphones for me and my parents and sister, so we got a new phone line for my sister. She's going to take my old phone temporarily until the other phones get shipped (because they didn't have 2 4's and a 4S in the store, so only I have my new phone.) I have a couple of questions.

How do you switch numbers between two cell phones?

If I set up a voicemail now, (the sales person said I had to wait 24 hours to switch numbers) will that voicemail greeting go to my sister's phone?

Umm I can't think of anything else, but thanks if anyone answers!

How to import music from iTunes to my iPhone?

I got a CD, but I wanted the music on my CD to also be on my iPhone. I followed the intstructions on iTunes for importing music from the CD to iTunes, and when I tried to put it onto my iPhone it wouldnt work. I tried following more instructions from the website but its not working.