AT&T, Verizon, Sprint and U.S. Cellular represent four of the biggest wireless service providers active in 2011. All four companies provide a wide range of services and mobile phones. AT&T is a GSM provider, so their phones all require SIM cards. Verizon, Sprint and U.S. Cellular all use CDMA technology, so their phones don’t take SIM cards. Each company has its own advantages to consider when choosing a provider. Writer Bio

Silver oxide is a chemical compound. This fine dry powder with a brownish-black color is primarily used in the preparation of other silver compounds. It is a three-dimensional polymer (i.e. chemical compound consisting essentially of repeating structural units) and is not readily soluble in most solvents. Although silver oxide hydrolyzes only slightly in water, it gives the water a distinctive metallic taste. However, silver oxide is soluble in dilute nitric acid and is easily attacked by acids....

Kerberos is a network authentication protocol that uses encrypted tickets to pass information over nonsecure networks. Kerberos authentication presents several advantages over other network authentication methods, so that the nodes communicating with each other can trust that the information they’re receiving is authentic and reliable, and that future sessions will have the same authenticity. Writer Bio

Facebook hacking is a phenomenon by which someone maliciously gains access to another person’s Facebook account. A person with ill intent can gain access through malware, or simply by finding out the other person’s password, then logging on and impersonating that person. There are several negative repercussions of having your Facebook profile hacked. Writer Bio

Stutters, pauses, interruptions, clicks and pops all interfere with the enjoyment of sound from your computer. Though there may be a variety of contributing factors, sound stutters usually come down to strain on the central processing unit of your computer, though your Internet connection may play a role. Writer Bio

If your laptop fans are running louder or more frequently than usual, this could be a sign that your laptop is running too hot and needs better air flow, or it could mean that your fans are getting old and starting to wear down. You can check your running processes to see if shutting down programs will help and to see if you are suffering from any memory leaks. Keeping your vents clean will also make sure your laptop runs cool, preventing your fans from working overtime....

Digital Subscriber Line, or DSL, is a popular choice for broadband Internet. Using a phone line to send the digital data into the home or business, DSL requires the use of filters at each phone jack. These filters affect not only the throughput of the broadband Internet, but the quality of the phone service. Since DSL and the landlines in the structure share the same wires, it is critical that these filters be properly placed and in use....

A privacy filter, also called a privacy screen or a monitor filter, is designed to protect a laptop or the screen of a desktop monitor from prying eyes and shoulder surfers. They decrease the viewing angle, allowing only the person sitting immediately in front of the screen, typically the user, to view the contents of the screen. Privacy filters fit directly above a monitor screen and attach securely in front....

Align to grid is a feature included in the most recent versions of Windows, which enables users to automatically arrange icons on the desktop based on an invisible grid. This means they will snap into position when created or moved. Writer Bio

Telephone communication is achieved through a variety of platforms, formats, media and devices in the digital age, sometimes even without the use of a telephone. Though cellular phones, smartphones and even computers are used to conduct voice conversations involving two or more parties, the standard upon which telephone calls have been based since the inception of the technology is a hard-wired connection and service. Writer Bio

The continuous nature of analog signals can present challenges in simulation design. The analog signal is also more sensitive to changes in parameters than digital signals. This must be take into account when performing analog simulation. Writer Bio

Buffering is actually an action taken to improve the streaming experience; streaming is commonly used on the Internet for media consumption because the viewer only needs the segment of the media they are currently viewing to enjoy the content as opposed to the entire thing with downloading. Buffering a stream helps work around any inconsistencies in the data flow while streaming content. Writer Bio

When you venture into the files of your computer, you’ll find countless names, many with extensions you may not recognize. If you use your computer to share or create videos, you might come across files with the extension .bdm and wonder what they are. Writer Bio

As of 2010, wireless spy cameras operate within a range of frequencies: 434mhz, 900mhz, 1.2ghz, 2.4ghz and 5.8ghz. Though other wireless surveillance methods are quickly coming to market, like the remote workstation spying conducted by a Pennsylvania School District, the wireless spy camera remains the backbone of most covert surveillance installations. Wireless spy cameras constructed in the future will likely operate at even higher frequencies, enhancing range and video resolution, due to continuing improvements made to wireless technologies....

Universal serial bus (USB) flash drives are removable storage devices that offer portability and storage capacities that older storage devices are unable to match. For this reason, USB flash drives have helped computer users that require a stable means of quick data storage and transfer. The history of the USB flash drive is relatively short, but introduced many significant benefits since the first USB flash drive hit the markets. However, the history of USB flash drives has not been without controversy....

Apple Inc.’s iPod started as an MP3 player, but gradually grew to perform a variety of tasks, such as browsing the Internet, playing videos and browsing images and other digital media. The iPod line now offers a variety of models, but they all run a similar system designed for audio playback. Occasionally an iPod may skip tracks, causing certain songs on your playlist to remain unplayable. This skipping can be the result of a number of possible errors, but most can be remedied without any need for technical assistance....

Media playback may degrade even on new computers. Stuttering and freezing within video and audio files may indicate a problem with your computer’s hardware, but the source of the disruption might also be tied to the file itself. You may need to experiment with settings and various media players to isolate the cause. Writer Bio

Updated August 01, 2017 In fact, they “work” in quite a few ways. They work for the planet by reducing waste, and they work for your bank account by saving you significant amounts of money compared to brand-new products. But just because something is green and saves you some green doesn’t mean it’s completely rosy – before you jump in to the wonderful world of refurbs, it pays to know exactly what the perks are, and exactly what sorts of purchases to look for....

RPM Package Open a terminal window by clicking the “Applications” menu, pointing to “Accessories” and clicking “Terminal.” Become the root user by typing “su” into the terminal and pressing “Enter.” Type the root account’s password and press “Enter” to authenticate. Type “rpm -qa | grep java” into the terminal and press “Enter.” The name of each installed Java package appears in the terminal. Type “rpm -e package” into the terminal, replacing “package” with the name of the Java package from the previous command....

Log in to the Tumblr website. Click the “Customize” button in the right sidebar. Click the “Edit HTML” link on the left sidebar to open Tumblr’s HTML editor. Scroll down and highlight your sidebar’s CSS code which will vary depending on your blog’s theme. For example, locate “#side{” and then highlight the code up to the closing bracket. Your blog’s theme may name this something else, such as #sidebar, #lefts or #leftbar....