What is the SMS Messages module? What kind of SMS messages can I send from Vtiger CRM? How can I send SMSes from Vtiger? How do I set up or configure an SMS provider in the CRM? Where is the SMS Messages module in the CRM? How can I send an SMS from the Contacts module? How can I send an SMS from the Organizations module? Can I send only a single SMS to any of my contacts? Can I send SMS messages from multiple gateways? Can I send SMS messages to all the numbers linked to a contact? What if the SMS service provider I want to use is not available in Vtiger CRM?  Where can I see the list of SMS messages I have sent to my customers? How can I find out if the SMS message I have sent has reached my contact or customer?