Because there is the potential to glean more and better information from someone who has already had the experience than you would obtain from a phone call to the provider. For example, if the OP or others already looked into this and found out it was some sort of bait-and-switch gimmick. Or, that there were unexpected fees. Or that it was only for a limited time. Or that there were limitations that were only disclosed in the small print when you were signing up. Etc., etc.
And now you know.
