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Sorry for the late response: email (K-9 Mail) uses IMAP idle, Signal uses a persistent websocket, and XMPP (Conversations) also uses long-lived TCP connections.
by chrismartin 8y ago
Sorry for the late response: email (K-9 Mail) uses IMAP idle, Signal uses a persistent websocket, and XMPP (Conversations) also uses long-lived TCP connections. I don't use any proprietary messaging apps that rely on Google's push notifications.