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Google Messages just flicked the switch on end-to-end encryption for all RCS and group chats
(chromeunboxed.com)
This is a most excellent place for technology news and articles.
That could be battery optimisation of the recipients phone.
nope, we tried everything and she rarely received messages on time, even when she was on her phone and I send something she wouldnt get a notification till much later and I think even opening the app didnt show it