If you wish to store your client’s contact information in the WP SMS newsletter using GravityForms, the following function will assist you in doing so easily.
/**
* @param $entry
* @param $form
*/
function addNumberToSubscriberList($entry, $form)
{
$name = $entry[1]; // Field ID
$mobile = $entry[2]; // Field ID
$groupId = $entry[3]; // Field ID
\WP_SMS\Newsletter::addSubscriber($name, $mobile, $groupId, '1');
}
add_action('gform_after_submission', 'addNumberToSubscriberList', 10, 2);