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Signal and Threema want nothing to do with WhatsApp
(www.androidpolice.com)
This is a most excellent place for technology news and articles.
A bit offtopic, but, are SMS free on the US?
Indeed, in my country SMS are not used at all. Too expensive compared to alternatives.
Here I pay 1 euro per month extra for unlimited calls+SMS. Still no one uses it.
Most plans include unlimited text messaging.