The best replacement for pinger is viber.

The best alternatives to pinger are rated as following:
★★★★★  viber
★★★★  google voice
★★★★  textplus
★★★★  textfree
★★★  talkatone
★★  textme
★★  text free
★★  heywire
★★  textnow
★  line2
  textfree better
  yuilop
  text plus

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

Other search terms related to pinger and their ratings are:
★★★★★ textfree
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Google Trends

Scale is based on the average worldwide traffic of pinger in all years. Click on graph for more.
pinger
viber
google voice