The call map reveals some interesting connections based on phone calling patterns. Some states merge like Kentucky and Tennessee or North and South Carolina. California splits into a northern and southern region. Illinois drops the southern half of the state and merges with eastern Wisconsin.
Next, looking at a map based on SMS (text messaging) patterns shows several variations to the call map.
First off, notice how California, based on SMS patterns, is now split into three regions and the Georgia / Alabama alignment based on phone calls has split based on SMS patterns.