Is it worth getting an Iphone 5? - 2

I currently have an Ipod touch (not sure which generation. It has a camera but is not new enough to get the IO7 update). I have started a job recently (I'm 18) and I have built up like £600 in my debit account. Anyway, I was wondering whether to buy an iphone but did not know whether it would be worth it. I never hardly text people, so I don't really need it for the phone side (so I'd use pay as you go if I can with an iPhone). I would mainly want it because it looks good, and because I can get internet on it anywhere (such as at work) which I can't with an Ipod touch.

So, a few questions:
1) Is it worth getting an Iphone bearing in mind that I will hardly be actually using it as a phone?
2) Can you have an iPhone on pay as you go?
3) Is there an iPhone 6 (or whatever it will be called) coming out soon? I don't want to spend money on an iPhone 5 for it to not be the most updated version in a few months.

If you using it for just music & games then get an iPad or new Iopd touch but get iPhone 5 if it for texting call & internet

Get 5S as its far better and same price as 5 used to be.