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Can you set up phone alarms/reminders with org-agenda or something similar?

I can think of two easy solutions. One would be to synchronize Google Calendar and org-agenda and let Google Calendar manage the alarms/reminders in the phone. This already exists.

The other solution would be to develop an app which polls emacs/org-mode for alarms/reminders. AFAIK this doesn't exist but it would be pretty easy to make.

Can org-mode sync to CalDAV servers? Then you could use eg. Sandstorm.io's hosted Radicale app.

There are a few packages that do that, here's one that does two-way syncing: https://github.com/dengste/org-caldav

I use it to sync with a Radicale server.

I really mostly use the agenda view, but if I really want reminders on the go (like I'm taking a trip) I use MobileOrg and the android client with dropbox.

http://orgmode.org/manual/MobileOrg.html

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