Amazon SNS says: "Each SMS message can contain up to 140 bytes, and the character quota depends on the encoding scheme. For example, one SMS message can contain: 160 GSM characters or 140 ASCII characters or 70 UCS-2 characters"

Clickatell.com

First check SMS-API Documentation and setup simple REST call.

Archive of documentation I had to browse some documentation and found the answer at Advanced message send / Multi-language Unicode messaging

So for characters other than regular GSM characterset Clickatell expects UCS-2 (Big Endian) character encoding and unicode=1 parameter set. So 70 characters will be the limit. We will have to split the messages since our messages consist of up to 180 characters.

PHP code to convert UTF-8 text to HEX encoded UCS-2 acceptable by Clickatell:

$message = bin2hex(mb_convert_encoding($text, "UCS-2", "UTF-8"));

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