Method 

Description 

available 

This function checks if there are any unread SMS. 

beginSMS 

This function is the step one of sending an SMS, which is to input the destination number. 

endSMS 

This function is the last step of sending an SMS, which is to confirm and send out the SMS. 

flush 

Deletes the unread SMS. This function requires an unread SMS checked by available(). 

peek 

Reads the content of the unread SMS, one byte at a time without moving the cursor. Repeatedly calling peek() will return the same result. 

read 

Reads the content of the unread SMS, one byte at a time. The difference between read() and peek() is that read() moves the cursor but peak() does not. 

ready 

This function checks if the SMS module is ready or not. 

remoteNumber 

This function returns the source number of the unread SMS. 

write 

This function is the step two of sending an SMS, which is to write one byte at a time into the SMS content. You can also use print() to write one string into SMS content at a time.