Quarterly report pursuant to Section 13 or 15(d)

Revenue (Nature of Services and Products) (Details)

v3.8.0.1
Revenue (Nature of Services and Products) (Details)
3 Months Ended
Mar. 31, 2018
payment
Certain wireless devices  
Disaggregation of Revenue [Line Items]  
Program period 24 months
Trade-in equipment  
Disaggregation of Revenue [Line Items]  
Number of installment plan payments 12