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What is GSM?
Global System for Mobile Communication. Originally developed as a pan-European standard for digital mobile telephony, GSM has become the world’s most widely used mobile system. It is used on the 850 Mhz, 900 MHz, 1800 MHz and the 1900 Mhz frequencies.
What Is An Unlocked Cell Phone?
Simply put, an unlocked cell phone is a GSM cell phone that is NOT locked by the manufacturer or network provider to be used in a specific country or or a specific carrier! You are free to use the phone where you want, and with which ever carrier/network provider that is compatible with the Unlocked GSM Cell Phone.
What are GSM Bands 850/900/1800/1900?
GSM technology can work on up to 4 frequencies: 850 Mhz, 900 Mhz, 1800 Mhz, and 1900 Mhz. Some GSM phones support all the bands or frequencies, or just a couple. A dual band phone supports only two, usually 900/1900 or 850/1900. A tri-band phone supports three bands, either 850/1800/1900 or 900/1800/1900. A quad-band phone supports all GSM bands. Quad-band phones are able to work with any and all GSM service providers. On the other hand, GSM service providers support just a subset of all the GSM bands available. Before buying a GSM phone, make sure the phone supports at least one of the bands that your GSM service provider supports.
What is a sim card?
A sim card is a small flat rectangle plastic that contains a microchip. This microchips is the heart of your phone, it contains your phone number, your address book, and the necessary information for your phone to work. All sim cards look the same, but the microchip inside is different for every GSM service provider.
How do I choose the right transformer?
On the back of your appliance, you will find a label describing the power requirements. You should see a label describing the Wattage (W) or the Amperage (A) of the appliance. Once noted, choose a voltage transformer / converter which can handle a higher amount of wattage then your device is rated at. Certain devices which are motor based may require additional power to start up then indicated (know as Surge), in this case always add an extra 20% to the power requirements of your device. |
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