I rejected a call from this number, as I do for all numbers that I do not recognize.  One website suggests that the caller is "Grande Communications Networks, Inc.," and has a ll sequential phone numbers from 972-914-2000 through 972-914-2999!  Someone has obviously sold/provided my cell number to the mass communications industry as I receive such calls many times weekly, and frustratingly so, often times these calls are on Saturday morning.  I  now have over 40 different  numbers on my "call reject" list and am adding several more per week.  If anyone has any suggestions on how to stop this I would be grateful for the answer.  (The Do Not Call register does not appear to help at all.)