One of the best places to use both internet and phone service for free is in any apple store.  I almost always visit the Apple Store when one is in the near for a few reasons.  1) They usually offer free phone calls on their iPhones.  Just pick it up and usually any iPhone calle will be free.

The internet is also available for free, meaning that if you brought your own headpphones and mic, you might even be able to make a few free voip calls right in the Apple store.  Sure they might look at you funny, but I doubt they will say anything since customer is almost always king…