world of mobile telephony is a confused one, especially these days, the question of how to start a mobile enterprise. Few things are as confusing perhaps as the GSM frequencies and GSM phones, which operate in some parts of the world, but does not appear in others.
Several band mobile phones and GSM frequencies can be confusing, especially for all who wonder how to start a mobile enterprise.
So what is the background behind the GSM network?
The GSM network has been proposed by a group of engineers and policy makers in Europe in 1982 and did not take long to adopt telephone consumers and policymakers in the new network, after the first time in 1991. It was not long before it grew GSM coverage in a growing number of countries.
The GSM world has increased rapidly. There were more than one million subscribers by 70 airlines in 30 countries in late 1993.
Not only is the new mobile network GSM to send and receive all their digital information and making the first mobile phone 2G to grow, there was also a high degree of freedom to the user what they have done with. For the first time, they can each send short text messages at a fraction of the price of a call, they might change their operator and / or go to another country without a new phone.
All they had to do was a GSM SIM card and replace it with another GSM card and they were in business.
But, as the unknown powers of the world order, things should not be as simple and adjust the frequencies of most GSM networks GSM already allocated to other uses in government should be.
So in a situation very similar to television viewers and those with surveillance systems, a phone that would not be covered in Sussex, England, everything worked in San Antonio the United States. Basically, this was not the case for an adjustment of all GSM frequency.
As a result, many mobile phone manufacturers to create phones that can work with more than one band with working groups with a maximum of 4 bands.
However, this does not mean that there are no questions, and people who are too often asked:
* What GSM?
* What are the GSM frequencies?
* Why mobile phones have more than one group?
* Will work in various fields of different frequencies?
* How can I check if a phone number to work in a particular area?
* How many telephones band broadly defined and where they will work?
We will try to examine these issues in this article.
What is GSM?
GSM, Global System for Mobile Communications (or the abbreviation officially called Group Special Mobile) is called a wireless transmission for mobile phones and wireless modems used recently. GSM and CDMA, GSM networks differ in the use of a SIM card to store all necessary information and send and receive calls, which is on CDMA phones, with everything stored on the phones.
If you look at how to start a mobile business, and you do not have thousands of working capital GSM mobile phones will probably be a better option than CDMA, as they are not attached to a particular carrier and you do not need a single vendor authorized to sell mobile phones are unlocked.
Another reason is all about GSM CDMA, they open up the potential clientele of each phone. As unlocked GSM phones can be used with all GSM networks. So far, there is no such thing as an unlocked CDMA phone. When it comes to cell phone plans, most providers (especially in the States) love of CDMA phones, because it locks their customers to them.
Why mobile phones have more than one group?
GSM phones come with more of a band, so it works in more than one country, there are more than one GSM frequency and they are generally not transferable.
As a result, large manufacturers of mobile phones and mobile phones GSM / GPRS with multiple bands, so they can work in several countries. Most cell phones work on two, three or four bands. The dual-band phones are more flexible because it can be used anywhere in the world and is often cited as the result of international telephony.
While the phones of several bands are defined and where they will work?
Several band phones tend to be, how many GSM frequencies and can operate normally in four different categories are defined dual-band, tri-band and quad-band. When thinking about how cell phone companies to start, it is important to remember the different types of bands to measure the difference between their customers a high performance phone that they are happy with and can not and they get a shiny and expensive paperweight could imply.
phone dual-band GSM phone operates on two frequencies, and, depending on where the phone will probably work for frequencies 900 MHz and 1800 MHz. These phones are generally cheaper than other types of mobile phones and can be a good way to get a cheap phone to send SMS or MMS, and as a WAP phone.
The tri-band phone operates on three frequencies and can be used in most countries. This unlocked GSM cell phone is cheaper than the quad-band phone, but safer than a dual-band phone.
quad-band phones, phones or international, as they are sometimes called, uses four bands and can be used anywhere in the world. If you start with a mobile phone company and ask what is the sale of an unlocked phone and you should correctly give the slightest problems with customers, it is likely that this type of phone.
What GSM frequencies?
Almost all of the world operates on the frequencies of 850MHz, 900MHz, 1800MHz, 1900MHz, and in some rare cases, 400MHz, but there are still some other frequencies at other locations. Set
chance to areas where the frequency of each work is pretty easy in the very general sense (although it is always worth it) must be examined. So if you go into areas where a mobile phone, you should be able to work to follow an index.
So what areas using GSM 900 and 1800 MHz signals, and where you use the GSM 850MHz and 1900 MHz can be divided into two groups in general.
If you travel with your cell phone in Oceania, Africa, Europe, Asia (excluding Japan and Korea), the Middle East, Brazil and the Baltic region and search for networks of ‘roaming then the coverage of cellular network or 900 MHz, 1800 MHz or 900 MHz and 1800 MHz.
If you are the best for a world GSM phone working in the U.S. or South America, then you are stuck with a cordless phone running on the 850 MHz and 1900 MHz will bands.
Will work in various fields of different frequencies?
With the majority of the GSM technology platform is divided into two groups (one with the world’s largest four GSM frequencies to 900MHz broken and / or 1800 MHz and 850 MHz, and / or 1900 MHz Most GSM phones are unlocked in a factory, two or three GSM frequencies in the world that you /> a certain level of international roaming in an open phone.
< br /> What should I do if, in a telephone inspection work in a particular area?
There are two ways to check if a phone number at work in a given area, is the first group go to the phone, which can usually be found on the product description will be found.
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