Meanwhile, 2G ran on GSM, D-AMPS and IS-95. The key technologies for 3G were WCDMA and CDMA2000. Before these two networks existed, 3G was deployed in 2001 and 2G rolled out in 1991. Its predecessor 4G was implemented in 2009 and uses Long-Term Evolution tech - hence the 4G LTE designation. When you see numbers like 4G and 5G, the "G" simply stands for "generation." That means 5G is the fifth-generation mobile network, 4G is the fourth generation network and so on.Įach generation network uses a different technology standard. To understand GSM phones and SIM cards, you need to know more about mobile networks. Renting a phone allows someone to get a phone when they do not wish to or are unable to use his phone overseas. This allows him to use the phone without paying his domestic carrier’s roaming charges. The information stays with the SIM card so the user can simply pay a fee to use a compatible phone of his choice while traveling in a different country. This is possible because he can insert the chip in various phones and use them in different countries. If a person does not have the appropriate phone for a GSM SIM card, it is possible to rent an international phone. This card allows the user to use the same phone number internationally, no matter which country he is in. Once a user has an unlocked phone that will work with the GSM network as well as the correct frequency, he can use the GSM SIM card. A phone that uses the proper frequency is important because even if a phone can use the GSM network, if it is not on the correct frequency, it still won’t work. In many European countries, that frequency is 900 MHz or 1800 MHz. To use a GSM SIM card, a user will need an unlocked phone-that is, a phone that is able to use SIM cards from different phone carriers-that uses the GSM network and works at the frequency the destination country uses. This network is not the primary network used in countries such as the United States, which is why many US residents have trouble using their phones overseas. The GSM network is the network used by most countries in the world, allowing cell phone users to carry their phones from country to country. Having this card in an unlocked cell phone while using the correct frequency allows a cell phone user to use his cell phone in various countries all over the world.
A Global System for Mobile Communication Subscriber Identity Module, or GSM SIM card, is a SIM card that uses the GSM network.
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