Im sending an sms using the url. The url itself is good if i directly copy it from the warning an open it myself it does send the sms properly but throws out an error when im trying to fopen it. Url is https.
My guess is that you'll have more success using the cURL functions, as you can then add settings for HTTPS connections. You'll probably need to include this setting:
curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, false);
Worked, i had an empty space " " in url, fixed that and all worked.