The thing is that the logs you attached show nothing useful. You always omit the part that you must show and that's funny. Showing me that the Whatsapp servers require x minutes to retry isn't helpful. That's why it's always better to upload the whole log somewhere and give me the link. The part I need to see is when the Whatsapp servers send the "success-sent" XML file and the following lines after that. Also, is Yappari closing (crashes) when it waits for the SMS? Does the SMS arrives and Yappari ignores it, or is it just that the SMS never arrives?