The best replacement for phone line is power line.

The best alternatives to phone line are rated as following:
★★★★★  power line
★★★★  cable internet
★★★  fax line
★★★  analog phone line
★★★  data cable
★★★  voip
★  phone line
★  2 wire
★  data line
★  digital phone line
  cable line
  ethernet line
  dsl cable
  internet cable
  ethernet cable
  cat 5

Your alternative for phone line is not listed? Suggest!
Speaking about phone line, one probably shouldn't forget about internet.

Other search terms related to phone line and their ratings are:
★★★★★ internet
★★★★ broadband
★★★★ bt
★★★ dsl
★★ cat5
★★ nbn
★★ fax
★ sky
★ direct tv
★ service
★ phone service
★ virgin
★ computer
verizon
directv
telstra
bell
directv dvr
You have in mind a companion for phone line and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of phone line in all years. Click on graph for more.
phone line
power line
cable internet