SMS provider – it`s company, which provide customer with sending/getting SMS service, but doesn`t work as mobile operator. SMS provider offer just separate channel for sending customer`s messages and just send it to Short Message Service Centre of Mobile operators.
SMS provider has a contact with Mobile SMS operator and this contract does not cover direct connection with Mobile operator’s infrastructure. So SMS provider could only guarantee SMS delivery just to Short Message Service Centre, after that provider couldn`t control message status.
To set up connection with SMS provider you need access to [SMS providers] section. If user has no access to section [SMS providers], he need reach his system administrator. If this section doesn`t appear in any workspace, it could appear as in How to add workspace said.