Yes, you can do this by edit the SMS Receipt template
Username: {$u.username|escape}
Password: {$u.password|escape}
{if $u.expire_time > 0}Expires: {$u.expire_time|nwadateformat:"iso-8601"|escape}{/if}
make sure you are connected to the <SSID name> wifi network then click the below link:
https://<FQDN>/guest/<Register page name>_login.php.php?username={$u.username|rawurlencode}&password={$u.password|rawurlencode}"
and then when the user receive the SMS he can just click this link and he will be login automatically.
regards
Mahmoud Refaat
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