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⭐ In the context of Bratislava, how are SIM cards utilized to provide a more comprehensive understanding of the city’s daily population?

Bratislava uses data from active SIM cards to estimate the number of people physically present in the city each day, which is higher than the official resident population, reflecting commuters and visitors.

⭐ Core Definition: SIM cards

A SIM card or SIM (subscriber identity module) is an integrated circuit (IC) in the range of a 25 MHz 32 bit CPU, and 256 KB of NVM. SIMs are intended to securely store an international mobile subscriber identity (IMSI) number and its related key, which are used to identify and authenticate subscribers on mobile telephone devices (such as mobile phones, tablets, and laptops). SIMs are also able to run apps and to store arbitrary information like address book contact information, and may be protected using a PIN code to prevent unauthorized use.

These SIM cards are always used on GSM phones; for CDMA phones, they are needed only for LTE-capable handsets. SIM cards are also used in various satellite phones, smart watches, computers, or cameras. The first SIM cards were the size of credit and bank cards; sizes were reduced several times over the years, usually keeping electrical contacts the same, to fit smaller-sized devices. SIMs are transferable between different mobile devices by removing the card itself.

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👉 SIM cards in the context of Bratislava

Bratislava (German: Pressburg; Hungarian: Pozsony) is the capital and largest city of the Slovak Republic and the fourth largest of all cities on the river Danube. Officially, the population of the city is about 475,000; however, some sources estimate the daily number of people moving around the city based on mobile phone SIM cards is more than 570,000. Bratislava is in southwestern Slovakia at the foot of the Little Carpathians, occupying both banks of the Danube and the left bank of the River Morava. The city is situated on the border of three countries—Slovakia, Austria, and Hungary—and is the only national capital to have land borders with two other sovereign states. Its geographic position places it exceptionally close to the Austrian capital Vienna, making them the closest pair of capital cities in Europe at just 50 kilometres (31 mi) apart.

The city's history has been influenced by people of many nations and religions, including Austrians, Bulgarians, Croats, Czechs, Germans, Hungarians, Jews and Slovaks. It was the coronation site and legislative center and capital of the Kingdom of Hungary from 1536 to 1783; eleven Hungarian kings and eight queens were crowned in St Martin's Cathedral. Most Hungarian parliament assemblies were held here from the 17th century until the Hungarian Reform Era, and the city has been home to many Hungarian, German, and Slovak historical figures.

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