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The Concept Map you are trying to access has information related to:
analog vs.digital, cell phones, join the plan, incentives, fraud charges, analog, fast, unbreakable, broadcasting, digital, airwaves, radiotelephone, phone companies, operations 1's and 0's, not protable, clear reception, long distance, expensive, can relax, security, cosumers, inexpensive, on frequency, rural areas, security, easdropping, 650 million, fraud, compatible with north america, reliable, cb