termination wifi internet

Hello,

I signed the contract for using Sonera internet in last September ( 2011). Next June ( 2012) I will go back to my home country and come back to Finland next September(2012). I would like to stop using this internet because when I come back to Finland, I will move to new place and it has internet already there. I wonder that could I stop using Sonera internet from this June? And do I have to pay penalty money for it?

Looking forward to your reply,

Best Regards,