Introduction: Since the invention of the first cell phone in 1973, the use of cell phones has increased and dramatically changed the way people communicate. Cell phones are a portable device that uses frequencies to send and receive calls and text messages across two devices and is considered the most commonly used portable device. Cell phones use and emit radio waves and microwaves so inevitably that the question arises as to whether or not cell phones are dangerous. There have been many concerns that cell phone use can cause brain tumors and/or other health risks, so in recent years scientists around the world have been researching and are still researching to see if there are any links between cell phones and cancer and to understand whether cell phones are really dangerous. Cell phones transmit their signals using radio frequency wavelengths; this is part of the electromagnetic spectrum (pictured left). The electromagnetic spectrum is a variety of different types of radiation and electromagnetic waves; they all have a different wavelength range and exist in our world and throughout the universe. All different types of electromagnetic waves travel at the same speed in empty space, the fastest possible speed, that of light which is approximately 3 x 108 m/s. Electromagnetic radiation travels as waves, and the waves can be arranged by wavelength: from longest to shortest. A wavelength is the distance in the middle of two nearby peaks and troughs in a wave; a single wave is measured in meters. The shorter the wavelength, the higher the energy and the higher the frequency (frequency (f) is the amount of waves produced per second). If the wavelength is longer, the frequency will be... in the center of the paper... it can be updated and will not show the exact date the article was written, so this was a problem. The Internet was used to the maximum as it provided the latest and most up-to-date articles. While its reliability may be questionable, it simply depends on the sites used. As mentioned above, for reports and statistics, the sites used usually end in .edu, .org or .gov, other sites may be questionable. The Internet has provided both general and specific information, for example about the EM spectrum or information about radio waves. The Internet was also useful because magazine articles, newspaper articles, documentaries, and television programs were all easily accessible and didn't require much work to find. Overall, even though some opposing views did not have controlled trial evidence, the sources were still reliable when examining whether it was legitimate or not.