The best replacement for talkatone is google voice.

The best alternatives to talkatone are rated as following:
★★★★★  google voice
★★★★★  groove ip
★★★★  mo+
★★★  pinger
★★★  wephone
★★  gv connect
★★  gv phone mo
★★  textplus
★  google voice app
★  line2
★  magicjack
★  viber
★  textnow
★  spare phone
  vtok
  whistle

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

Other search terms related to talkatone and their ratings are:
★★★★★ google voice
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Google Trends

Scale is based on the average worldwide traffic of talkatone in all years. Click on graph for more.
talkatone
google voice
groove ip