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Why a phone scrambler? The Threat...

If someone is actively targeting you, attempting to gather information information for whatever purpose, it is almost guaranteed that your cordless and cellulat telephone conversations are being listened to using some types of ' spy equipment '.

And it is likely that there will be an effort to tap your hard-wired telephone as well - (more on that in a bit).

If you are using a digital cordless phone with spread spectrum technology, you can be faily confident that the signal between the handset and the base isn't being monitored.

However...

Once your cordless phone sends a signal from the base down the telephone line, you no longer have a digital spread spectrum signal.

The Solution
With this in mind, you may wish to install a phone scrambler on your line to secure your sensitive cordless and regular phone conversations. Doing so will prevent even Big Brother from making sense of your telephone calls.

Once available only to the military and government agencies, the very best units (such as the STU-III), costing just a few thousand dollars each, are available to the commercial market.

Phone scramblers may be divided into the following broad categories:

Frequency Inversion
The simplest form of scrambling - it inverts the high and low points in the signal.

If you are simply trying to keep someone from listening in on your conversation on an extension, this type of units will work but anyone who puts any effort into defeating the frequency inversion will have little trouble doing so.

Rolling Code
This one takes frequency inversion and add an additional function so that the pivot point around which the frequency is scrambled is continuously changing.

This makes decoding of the signal much more difficult. By using a rolling-code phone scrambler you will secure your conversion against any casual listeners, criminal eavesdroppers, and local investigators and law enforcement agencies.

These units are in about the same price range as the basic frequency-inversion ones.

Digital Encryption Digital
scramblers are the most secure and the most expensive. These units are used by the military and government agencies - and they start selling for 1500$ +.

If you are concerned about having your phone calls intercepted by government agencies or are afraid of industrial espionage, digital encryption is the answer.

But for most of us the sensitivity of our conversations does not require this level of security and the associated expense.

Please Remember
It is important to remember that you must have a phone scrambler on each end of the conversation - and that scrambling your voice on the telephone line does not defeat an electronic listening device that is placed to intercept room audio.

Max Penn allows you to get the evidence you want easily using spy devices. To get the evidence you are looking for you can go to surveillance equipment  articleson.com

A ringtone is the sound made by a mobile or cell phone to indicate an incoming call. Technically, a ringtone is a program that activates the phone’s speakers anytime it picks text messages or incoming call signals. Ringtones are based on a programming language called Ringing Tone Text Transfer Language (RTTTL) which was developed by Nokia.

Purpose of ringtones is to give a unique ring to a mobile phone so that it can be distinguished in an environment that has lots of mobile phone users. Almost all the newer phones from manufacturers like Motorola, Samsung, Siemens, Sony-Ericsson, LG, Sanyo, Panasonic now have ringtones capabilities. Ringtones are basically monophonic ringtones and polyphonic ringtones.

Early phones had the ability to play only monophonic ring tones. It comprises of a series of sequential tones at varying frequencies.

The difference between a regular monophonic ringtone and a polyphonic ringtone is equivalent to the difference between a solo flute player and the whole orchestra. Polyphonic ringtones can be played on mobile phones which are capable of playing more than one tone simultaneously. All the latest models support polyphonic ringtones. Many phones are now able to play more complex polytones; up to 128 individual notes with different instruments are played simultaneously to give a more realistic musical sound.

While polyphonic tones were better than monotones, they still sounded more like an old video game than the music they were patterned after.

An Mp3 is a compressed audio file. MP3 ringtones are near to CD quality sound. Also called master tones or true tones, these are usually bits of a real song, using your favourite music to alert you to a call. Voice ringtones, sound effects, and instrumental or lyrical music are all available as MP3 ringtones today. There is a wide variety of Mp3 ringtones available today. From Mozart to Madonna, the Beatles to Britney Spears, or even commercial jingles, national anthems, cartoon themes, gospel music, nursery rhymes, even beat poetry.

Most cell phones come with some ringtones pre-installed, but you can find the ones you really like out on the wireless web. There are several methods for downloading ringtones. You can subscribe to a service that will send them to your phone weekly for a fee. Or you can download new ringtones from your favourite band's website. Polyphonic ringtones are also available free of cost but there are some select ringtones that are also chargeable. Now a days these ringtones cost anywhere between 99c and $3. Some sites charge on a membership basis but you can download sample ringtones just for registering.

ll phone ringtones , mobile phone videos and cell phone games can be found here. Also check link polularity tools articleson.com

A mobile phone or cell phone is an electronic telecommunications piece of equipment. The majority of current cell phones connect to the network using a wireless radio wave transmission technology, although satellite phones are exceptions. These cell phones communicate by means of a cellular network of base stations, which are known as cell sites, which is in turn linked to the conventional telephone network and were first introduced in the early to mid 1980s, the so called 1G generation.

Earlier cell phones operating without a cellular network, the so-called 0G generation, such as Mobile Telephone Service, date back to 1946. In anticipation of the mid to late 1980s, most cell phones were sufficiently big that they were time and again permanently installed in vehicles as car phones. In the midst of the advance of miniaturization, at this time the vast majority of cell phones are handheld.

Features of a cell phone
In addition to the usual voice function of a telephone, a cell phone can hold up many additional services such as SMS for text messaging, packet switching for access to the Internet, and MMS for transferring and receiving photos and video. A number of the world's largest cell phone manufacturers consist of
•Alcatel
•Audiovox
•Fujitsu
•Kyocera
•LG
•Motorola
•NEC
•Nokia,
•Panasonic (Matsushita Electric)
and a lot more…..

There are in addition specialist communications systems related to, but separate from cell phones, such as Professional Mobile Radio. Mobile phones are also distinct from cordless telephones, which in general operate only within a limited range of a specific base station. Technically, the term cell phone includes such devices as satellite phones and pre-cellular mobile phones such as those operating via MTS that do not have a cellular network, while the related term cell(ular) phone does not. In actual fact, the two terms are used almost interchangeably, with the favored term varying by location.

Technology on which cell phone works
Cell phones and the network they function under vary a lot from provider to provider, and even from nation to nation. On the other hand, all of them communicate through electromagnetic radio waves with a cell site or base station, the antennas of which are by and large mounted on a tower, pole, or building. The cell phones have a low power transceiver so as to transmit voice and data to the nearby cell sites, usually 5 to 8 miles away.

When the cellular phone or data device is turned on, it registers with the mobile telephone exchange, or switch, with its only one of its kind identifiers, and will then be alerted by the mobile switch as soon as there is an incoming telephone call. The handset continuously listens for the strongest signal being received from the neighboring base stations. As the user moves in the region of the network, the mobile device will hand off to new cell sites.

Cell sites have comparatively low power (habitually only one or two Watts) radio transmitters, which broadcast their being there and relay communications involving the mobile handsets and the switch. The switch in turn connects the call to a different subscriber of the same wireless service provider or to the public telephone network, which includes the networks of other wireless carriers. The conversation between the handset and the cell site is a stream of digital data that includes digitized audio (except for the first generation analog networks).

The technology or the know-how that achieves this depends on the system that the  cell phone operator has adopted. A number of technologies include AMPS for analog, and TDMA, CDMA, GSM, GPRS, EV-DO, and UMTS for digital communications

Barbara Rittner is a wireless communications technology expert. She frequently regsiters her views on phones.blogtastic.com articleson.com

Everyone is asking what kind of GSM phone to get: Dual, Tri, or Quad band? Since there are two frequency bands that are used by GSM services in the United States, and also two different frequency bands are used in the rest of the world, ideally, one would want a quad- band phone – one that works on all four bands. This should be your first choice when seeking a phone. However, since some of the best phones can still be expensive and hard to find, many gravitate toward the second best choice, the tri band phone. When doing this, be mindful which three bands your phone has, as some bands are more useful than others.

The United States originally only used 1900 MHz for its GSM service, but more recently, there has been a growing amount of GSM service on the 850 MHz band. When choosing a phone, it’s important to know how you will be using it. For example, if you are in the United States and operate with in the major metropolitan areas, you won’t really miss the 850 MHz bank. On the other hand, if you regularly travel to secondary areas, you will benefit from the extra coverage that the 850 MHz band provides. Basically, if you travel outside of the big cities, you’ll want a phone that supports 850 MHZ and 1900 MHz.

Internationally, things are a little different. In the beginning, all countries with GSM service used the 900 MHz band, but due to congestion, service providers have been adding 1800 MHz coverage. When GSM became available in the United States, a few other countries chose to used the same frequencies the U.S. used – 1900 MHz, and in some cases, 850 MHz. Most international countries that use the non U.S. international frequency banks have 900 MHZ service. Many also have 1800 MHz service. All international countries that have the U.S. frequency bands have 1900 MHz service. A few may also have 850 MHz service. So, which frequencies do you need when traveling internationally? That depends on where you’re going. Generally, 900 MHz is the most common band used internationally. 1800 MHz will give you expanded coverage in countries that also use 900MHz.

Ideally, your phone should support all four bands. In the real world, not everyone is going to have a quad band phone, so here are some guidelines:

If you’re only using your phone in the United States, and you get a dual band phone, make sure it has both 850 MHz and 1900 MHz. If you must get a single band phone, one with 1900 MHz only will give about the same amount of coverage.

If you’re going international, and your countries have international frequencies, get a dual band phone with 900 and 1800 MHz. If you must go single band, one with 900MHz will be almost as good. If your countries have U.S, frequencies, get a tri band phone with 900, 1800, and 1900 MHz. This type of phone is excellent internationally, and very good in the United States. Another type of tri band is 850-1800-1900. This one is great for the United States, but not very good internationally.

For more detailed information, or to view coverage maps, visit the official GSM association website.

by - P. Birmingham: Mechanical Engineer, MBA, Six-Sigma Green Belt, Web Master (Cell Phone Digest, Insurance for Everythingand mZeus.com ) articleson.com