Certain firewall products interfere with how your web browser operates.

CBFSMS.com requires that your web browser pass it the "referrer". This means that when you click a button on our site, your web browser tells us what page you were on before. By doing this, we check that you are on our official CBFSMS.com website and not a fake or illegal copy!

However, CBFSMS.com will NOT check what website you were using previously under normal circumstances. Therefore, you can be assured that it is absolutely safe to disable "privacy protecting" software when using our site, described below.

Firewalls like the popular Norton Internet Security and ZoneAlarm Pro sometimes disable the "referrer" automatically. You must turn off this privacy feature OR DISABLE THE FIREWALL when using CBFSMS.com

If you do not allow your browser to send the referrer to us, you will get the "Illegal Calling Method Detected" error and will not be able to use our site.