How do I implement SMS Alerts for tasks assigned in SharePoint?
Is there a web part or feature available?
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This is built in to SharePoint 2010
In central administration, you need to provide the URL of SMS service, credentials. You can check the SMS service by hitting the test service button.
It works over Office Mobile Service Protocol like mail uses SMTP. This OMS actually allows client to send text and multimedia messages to server which processes the request and sends to the destination mobile number.
Even the SMS can also be replied and service can then deliver this reply in terms of SMTP mail.
SharePoint App Store has an App (add-in) : SMS for Office (Send SMS Via SharePoint List)