Verizon Communications (NYSE: VZ) is expected to post its first year-over-year increase in service revenue since 2014.Verizon saw service revenue tank after T-Mobile (NASDAQ: TMUS) started its Un-carrier initiatives, including unbundling installment plans and service contracts and bringing back unlimited data plans. The moves, combined with Sprint's (NYSE: S) aggressive pricing, put pressure on the larger competitor to follow suit and make some customer-friendly changes in order to prevent subscriber losses.