"I just wanted to tell you how great it was to travel with OneSimCard. We had to be in the UK, Ireland, Poland, Greece, Cyprus and South Korea. It worked so well everywhere - NO problems! Thanks!" Colleen B., CA USA
"I am really impressed with OneSimCard cell phone service. I used it with my old unlocked Motorola V3 phone in 4 countries - Italy, France, China and Hong Kong. It worked everywhere without a glitch and saved me at least $400 in two weeks that I was traveling abroad." Bill B., MA USA
A system where each geographic area is covered by a base station. This area is known as a cell. Each phone in the cell communicates with the base station. If the phone moves to another cell, the call is automatically transferred to the base station in the new cell location.
GSM
GSM stands for Global System for Mobile Communication, a widely used digital mobile phone standard.
GSM 850
GSM technology with a cellular frequency band (800/850Mhz) operating mainly in the USA. Both the technology and the frequency have been around for a long time, but only in 2002 were they combined.
GSM 900
GSM 900, or just GSM, is the world's most widely used digital network and now operating in over 100 countries around the world, particularly in Europe and Asia Pacific.
GSM 1800
Also known as DCS 1800 or PCN, GSM 1800 is a digital network working on a frequency of 1800 MHz. It is used in Europe, Asia-Pacific and Australia.
GSM 1900
Also known as PCS 1900, GSM 1900 is a digital network working on a frequency of 1900 MHz. It is used in the US and Canada and is scheduled for parts of Latin America and Africa.
SIM card (Subscriber Identity Module card)
A small printed circuit board that must be inserted in any GSM/GPRS/3G based mobile device. It contains subscriber details, security information and a variety of other functions such as memory storage etc.
SMS (short message service)
Available on digital networks allowing messages of up to 160 characters to be sent and received via the network operator's message centre to your mobile device.
