[mobilebill]

Hi there,
The handset user would not receive any messages asking them to text "join <keyword" to any shortcode. The instructions on your site (sms_signup.php) shows your users how to request billing directly from their handset. Once this is requested, the first text message they will receive is the password message, which is chargeable. The users charges should be:

1x Standard text rate (phone user sends "join keyword" from their mobile phone to our code 78889)
1x Premium text rate (at specified tariff) to receive the password(s) (from our systems to mobile phone)