Global system for mobile communication (GSM) is wide area wireless communications system that uses digital radio transmission to provide voice, data, and multimedia communication services. A GSM ...

Over on Hackaday.io, [bobricius] took this technology and designed something great. It’s a GSM cell phone with a case made out of FR4. It’s beautiful, and if you’re ever in need of a ...

He decided to go with the low-cost SIM800L GSM modem, but as it only works on 2G networks, provisions have been made in the board design to swap it out for a more modern module should you desire.

The SIM card contains at least two numbers that identify the customer; the international mobile subscriber identity (IMSI) and a secret authentication key number K. The SIM contains a microprocessor, ...

But arguably, the most important development of this decade was the Global System for Mobile communications (GSM), the first fully digital cellular standard. In 1991, GSM’s efficiency was ...

In this way the customer ID (and personal number) is tied to the SIM card and not to a certain mobile phone. This allows for a seamless interchange of the same SIM card between different GSM ...

That’s where an in-force illustration comes in. The best life insurance companies will be able to present you with an in-force illustration for your permanent life insurance policy. Here ...

Cell membranes protect and organize cells. All cells have an outer plasma membrane that regulates not only what enters the cell, but also how much of any given substance comes in. Unlike ...

While the best unlocked phones almost certainly support GSM carriers like AT&T and T-Mobile, it’s best to look for devices that work with all the major U.S. providers, including Verizon.

It is very similar to using wireless VoIP-telephony on your GSM mobile phone. The UMA-enabled phone is also be able to use regular GSM base stations as any normal mobile phone can. The handset is ...

The sun is the ultimate source of energy for virtually all organisms. Photosynthetic cells are able to use solar energy to synthesize energy-rich food molecules and to produce oxygen.

The Library's modern botanical illustration collection is continually growing, as we complement our historical collection with work from the finest modern botanical artists. Botanical illustration is ...