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Free Software Foundation Turns 40, Unveils LibrePhone
(linuxiac.com)
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I'm afraid I have no idea what an RCS is, but maybe that's a network/region specific thing? I'm in the UK using GiffGaff (O₂) and the phone, SMS, and data works exactly as well as everyone else's... which is to say perfectly in most places and sporadically on the train due to the dead zones on the route.