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It could at least ask the user the question. "One of the users on this thread has deregistered their number. Would you like to send by SMS so that they are in
by hcurtiss 5y ago
It could at least ask the user the question. "One of the users on this thread has deregistered their number. Would you like to send by SMS so that they are included, or are you comfortable excluding them from this conversation? The SMS message would not be encrypted."