I know the feeling and so do you: you leave your house or apartment, and half way to your destination, you realize you forgot your cell phone. An OMG moment! I've done it a hundred times and often will trek back to my pad to retrieve my device.

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Now, you feel safe having that cellphone with you. If there's ever an emergency—no matter where you are—you can call 911 for help. Unfortunately, that sense of security is not always all it's cracked up to be.

A new report from CNBC finds that when the 911 system was first developed, cell phones , for the most part, did not exist. Nowadays, the majority of emergency calls now come from mobile devices, which is a problem. The location information transmitted to 911 dispatchers is unreliable and often inaccurate. Check out the video for details

To be honest, I will continue to bring my cell phone with me everywhere, but it is important to know it's limitations in an emergency situation.