Sends an SMS message to the given phone number. Returns 'Message queued successfully' on success, or an error message on fail. ** Available only on our Professional and Enterprise Service Plans. Sends an SMS message to the given phone number. Queue priority is set based on Priority parameter - 1 gives high priority, 2 is normal, 3 gives low priority. Returns 'Message queued successfully' on success, or an error message on fail. Sends an SMS message to the given phone number. Returns an instance of an SMSSendMessageResponse ** Available only on our Professional and Enterprise Service Plans. Sends an SMS message to the given phone number. Queue priority is set based on Priority parameter - 1 gives high priority, 2 is normal, 3 gives low priority. Returns an instance of an SMSSendMessageResponse Sends an SMS message to the given phone number. Returns an instance of an SMSSendMessageResponse Returns an array of the X most recently sent SMS Messages Returns an array of (at most 1000) sent SMS Messages with IDs greater than the given one. Returns an array of (at most 1000) sent SMS Messages with IDs greater than the given one in strings with fields separated by the tilde (~) character. Field order is MessageID~CellNumber~MessageBody~SentDate~Success~Reference. Sends an SMS message to the given phone number. Returns 'Message queued successfully' on success, or an error message on fail. Get a list of incoming messages which match the given reference Get a list of incoming messages Get a list of incoming messages with the given Reference which arrived after the message with the given ID. Get a list of incoming messages which arrived after the message with the given ID. Get a list of incoming messages which arrived as responses to messages sent with Grext after the message with the given ID. Get a count of remaining messages Get the status of an outgoing message by suppying the message ID and account key ** Available only on our Professional and Enterprise Service Plans. Sends an SMS message to all the cell numbers provided. Returns the number of messages successfully queued, or an error message on failure. No messages will be sent by this method - for testing only. Returns 'Message queued successfully' on success, or an error message on fail. ** Available only on our Professional and Enterprise Service Plans. No messages will be sent by this method - for testing only. Returns the number of messages successfully tested, or an error message on failure.