src/Message.php
protected function calculateConcat()
    {
        $len = strlen($this->message);
        $i   = $this->concatLimit;
        $j   = 1;

        while ($i < $len) {
            $i += $this->concatLimit;
            $j++;
        }

        return $j;
    }
protected function calculateConcat()
    {
        $len = strlen($this->message);
        $i   = $this->concatLimit;
        $j   = 1;

        while ($i < $len) {
            $i += $this->concatLimit;
            $j++;
        }

        return $j;
    }
Calculate from the message string how many SMSes it may have to span.

@return int