The big drawback now is that no matter how you configure it, international recipients do not receive your mobile number as sender ID, instead receiving an irrelevant number as noted by the reviewer below. Version 3.3 worked perfectly in this respect, and so allowed recipients to reply directly. The reliability of Callwave has not been as good as with the systems used in version 3.3. The free sending is nice in the Callwave version, but reliability and ease of use are more important for me. I have requested Keaka Jackson that he reactivate the pay-by-send system of version 3.3 as an option, but no response so far.