EasySMS provides an easy way for readers to subscribe to SMS updates and for admins to send SMS messages to groups. Auto SMS with post publishing.
No, because that is illegal. A person must subscribe to SMS updates because they might incur charges from their carrier. If you add them without their consent, they could possibly come back on you with litigation for the charges and hassle.
No, only administrators will see the messaging center.
When you publish a post or save a published post if the post publish option is selected under EasySMS -> Settings
Yes, a user can unsubscribe at their will via the sidebar widget.
Yes, simply click on the EasySMS tab and click groups, or edit an individual subscriber to add them to groups.s