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For anyone using JMP, how's the 120 minute limit?
(sh.itjust.works)
XMPP (aka Jabber) is the community-owned standard for real-time federated messaging.
JoinJabber.org admin support chat
You have to talk a lot more than 2 hours before the per-minute fee starts to cost anything substantial. Unless you're on the phone all day every day odds are it will be cost effective for you.