When you decide to upgrade your phone or switch to a new mobile phone carrier there are a few things that you will want to understand about GSM networks and SIM cards. Before, mobile phones were luxuries and not needs. Nowadays, almost everyone has a mobile phone and people use them to stay in touch with family members and close friends as well as to be available for different types of business deals or even conferences. This makes choosing a suitable GSM phone a task that can be quite challenging, either in the US, the UK or internationally. When you are purchasing a GSM mobile phone or an unlocked phone, make sure that you know the technology that the phone runs on. The two basic types of mobile phone technology are CDMA networks and GSM networks. Aside from this, you should also look into the different benefits that various phone providers have. Many of the most important benefits include international roaming, reloadable minutes, mobile phone warranties and replaceable equipment. GSM networks stand for Global System for Mobile Communications, which is a standard that is utilized by many of the major GSM phone companies. One of the most important features included with GSM mobile phones is the ability to utilize a Subscriber Identity Module (SIM cards). This technology allows you to remove all the data that your phone stores in one convenient chip. In this way, if you haven't unlocked the phone, you will be prevented from using different mobile phone providers. This means that you cannot take all of your valuable data with you wherever you go. This convenience of quickly being able to use another unlocked GSM phone is one of the main benefits of these types of phones and networks. Some of the other benefits of unlocked GSM phones are: International Roaming International roaming comes into play when a mobile phone subscriber travels to an international country and is able to have arrangements with various operators that are not available in their home country. This gives business people the ability to seamlessly continue the communications that they kept in their home country. Transferability This feature basically refers to the ability of a phone to have a removable SIM card. Removable SIM cards allow users to open up the back of their phones, take out the cards, and use them in another compatible or unlocked GSM mobile device. Replaceable If you for any reason decide to use a new service provider, replaceable mobile phones allow you to maintain your service with no commitment to your mobile phone. All you have to do in this case is buy a new SIM card and have it activated in the phone. Reloadability With prepaid SIM cards you can reload your card to handle as many minutes of communication as you would like. Your SIM card will then remain valid as long as the minimum balance is maintained so that you can talk and text as normal. AT Electronic and Communication International Ltd is a global wholesale distributor and manufacturer of communication equipment. We carry Unlocked GSM Cell Phones, Cheap Unlocked GSM Phones and more! Visit our website at at-communication.com/en/ and browse our huge selection!