Yes, you can have it or not have it, how's that for choice
You can actually get different speeds, and a limited or unlimited amount of usage per month - I have a middlish speed and unlimited use (because I am actually powered by my laptop) but all variations are more than sufficient for Skype.
Cheapest one is 50 YTL/£20 a month as far a I recall, that would do you nicely unless you decide to have a website with over 4000 members who need keeping in line
£20 a month wouldn't give you much time at all on normal telecom (landline) rates for calls to the UK.