The best replacement for ringtone is ringback tone.

The best alternatives to ringtone are rated as following:
★★★★★  ringback tone
★★★★★  ringback
★  ring tone
★  caller ringtone
★  answer tone
  caller tunes
  singtone
  ringtone
  ring back tone
  download
  call tone

Your alternative for ringtone is not listed? Suggest!
Speaking about ringtone, one probably shouldn't forget about voice.

Other search terms related to ringtone and their ratings are:
★★★★★ voice
★★★★ flashing light
You have in mind a companion for ringtone and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of ringtone in all years. Click on graph for more.
ringtone
ringback tone
ringback