The SIM stores network state information, which is received from the Location Area Identity (LAI). Operator networks are divided into Location Areas, each having a unique LAI number. When the device changes locations, it stores the new LAI to the SIM and sends it back to the operator network with its new location.
Russia Technical Information - In Details. Russia Voltage. The voltage in Russia is 220 V which is the same voltage used in China, Greece, Russia, South Korea, and the United Arab Emirates. 220 V has an advantage over lower voltage such as the 110 V that it is cheaper to transmit.
A zener must be added to the gate of a MOSFET if the gate voltage comes from a supply that is above 20v. A normal transistor is a current amplifying device. For a load current of 100mA, the base current for a BC547 will need to be about 1mA. This means it has a current gain of about 100.