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Why's that? I understand the message would increase in size because of the encryption, but I think it would be technically feasible now. Didn't even apple just introduce encryption into their messenger? My issue with apple's encryption is it's closed source and apple only.

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Apple's iMessage just detects when the other party is using an iOS device and sends them an iMessage instead of an SMS. The GP is right; cell service is so aggressively regulated that there's no hope of carriers adopting a better standard, so the best we can hope for is that at some point mobile OS distributors agree on some open standard like the Signal protocol.

iMessage end-to-end encryption is not a recent introduction. It has been in place for several years, though I can't find the exact iOS version it was introduced in.

Recent to me is the last few years, technology-wise. Your timeline may look different.

Fair point. We are talking about a 5 year old product though...

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