Unicode or text SMS type can be specified in the constructor. The default is set to unicode.

Author: SecondeJK

sms/send-unicode-sms.php

@@ -7,7 +7,5 @@
 $client = new \Vonage\Client($basic);
 
 $response = $client->sms()->send(
- new \Vonage\SMS\Message\SMS(TO_NUMBER, BRAND_NAME, 'こんにちは世界')
-);
-
-var_dump($response->current());
+ new \Vonage\SMS\Message\SMS(TO_NUMBER, BRAND_NAME, 'こんにちは世界', 'unicode')
+);