Smartphone settings:
Open SMS Gateway.
Open Settings.
- POP3 server host name: pop.mail.yahoo.com
- POP3 server port: 995
- SSL: Yes - ticked
- Username: Yahoo email address
- Password: Yahoo email password
- Mailbox scan interval in seconds = 60
In Send Via options select Email 2 SMS.
In Email address to use enter your Yahoo email address.
Click Send to This Contact.