: You can send them sms (which is costly) and/or if user possesses an advanced mobile device you can send push notifications which are almost free but requires developing a phone app. For

@Cody1181609

You can send them sms (which is costly) and/or if user possesses an advanced mobile device you can send push notifications which are almost free but requires developing a phone app.

For the phone app development you probably can get away (depending on the application of course) with html5 and some JavaScript (see phonegap.com or appcelerator.com)

Also you could use twitter, rss and instant messaging bots.

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