I am currently on the vodafone 30 day sim only contract. I just received my first bill, which said that i would have to pay £30 line rental for 3 months, i think this is a little excessive & can't really afford to keep paying that on top of my contract. Do all phone companies charge this type of fee? I looked online & set longer contracts (18 months etc) don't seem to charge line rental? Is this true?