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These 0G systems were not , supported few simultaneous calls, and were very expensive.Several other countries then followed in the early to mid-1980s.Sound quality can remain a problem due to the design of the phone, the quality of the cellular network and compression algorithms used in .Cellphones have small speakers so that the user can use a feature and talk to a person on the phone without holding it to their ear.The SIM card is approximately the size of a small postage stamp and is usually placed underneath the battery in the rear of the unit.The SIM securely stores the and the used to identify and authenticate the user of the mobile phone.
In 1983, the was the first commercially available handheld mobile phone.
Low-end mobile phones are often referred to as and offer basic telephony.
Handsets with more advanced computing ability through the use of native software applications are known as .
Ten years later, in 2001, the third generation () was launched in Japan by on the standard.
This was followed by 3.5G, 3G or turbo 3G enhancements based on the (HSPA) family, allowing to have higher data transfer speeds and capacity.