Why would scammers want to look at my online landline telephone bills?

I got a fake email with one of those links to a fake site, they were hoping I'd follow the link and put my login into it. But, why would they want to go into that? All they can do if I fell for it is look at what calls I've made and how much my bill is. Can they do something with that information? If so,... show more I got a fake email with one of those links to a fake site, they were hoping I'd follow the link and put my login into it.

But, why would they want to go into that? All they can do if I fell for it is look at what calls I've made and how much my bill is.

Can they do something with that information? If so, what?
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