Reading a rulebook properly, spotting the terms that end accounts, and comparing true cost rather than headline price.
Compare on the rules that decide whether you keep an account, not on the number in the advert.
In the meantime, the glossary covers the terms this topic depends on, and the firm comparison already carries the underlying data.
Open the glossaryPaste it at checkout. If it does not apply, tell us and we will re-test it within a day — that is how the codes here stay honest.
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