public function sendBulkSms() {
    $config['upload_path'] = 'bulk_sms/';
    $config['allowed_types'] = 'txt';
    $this->load->library('upload', $config);
    if ($this->upload->do_upload('text_file')) {
        $upload_data = $this->upload->data();
    //------------------send sms---------------
        $file_content = file_get_contents(base_url()."bulk_sms/".$upload_data['file_name']);
        $mobileNO = explode(',', $file_content);
      //$mobileNO = array("8801670750680", "8801942762160");
        $smsFormat = "Hi, this is a test message";

        function httpGet($url) {
            $ch = curl_init();
            curl_setopt($ch, CURLOPT_URL, $url);
            curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);

            $output = curl_exec($ch);
            curl_close($ch);
            return $output;
        }

        $user = "aclandctg";
        $pass = "CTgAcLAnd87%23_";
        $sid = "8804445650490";
        $url = "my_sms_api_url";
        $SMSText = urlencode($smsFormat);

        foreach($mobileNO as $mobile_no){
            echo httpGet("my_sms_api_url?user=$user&password=$pass&sender=$sid&SMSText=$SMSText&GSM=$mobile_no&type=longSMS&datacoding=1");
        }
     // -----------end send sms----------
    }
}