i been with sky for my landline for 4 months if i leave will i be charged i guess i will but what will they charge me

Anything up to the remaining moths line rental charges on your minimum term. So if the minimum term is 12 months and you cancel now that could be 8 months worth of line rental.

See the T&C's here.

http://www.sky.com/portal/site/skyco.../skytalk/terms

You have to scroll down quite a way to find sections 7 and 8 that explain all.

i was just talking to a phone company and they say my line as been tagged they say i would need a new line if i change over , sounds very naughty if sky as done that
why would they do it

Its not been tagged, your line has been Fully Unbundled by Sky.

Basically you connect to Sky's equipment in the exchange and not BTs. Know as LLU.

I believe you can go from Full LLU to Full LLU (such as TalkTalk) but am unsure...