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Beeper vs Apple battle intensifies: Lawmakers demand DOJ investigation - Android Authority
(www.androidauthority.com)
This is a most excellent place for technology news and articles.
TIL, I did not think it was possible to use SMS with another app on iOS.
I don't think you can use a different app for SMS on iOS. Messages only.
But u can disable iMessage functionality (iMessage is the network-based instant messenger component).