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 ...

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, ...

A team of biologists and engineers at UC San Diego applied advanced mathematical tools to answer a basic question in cell biology about how cells move and discovered that the mechanism looks very ...

Their latest Kickstarter venture is the RePhone, an open source and modular cell phone that will allow hackers to put together a phone by blending GSM modules, batteries, screens, and other stock ...

Various types of fuel cells exist, but the one automakers are primarily focusing on for fuel cell cars is one that relies on a proton-exchange membrane, or PEM. In the generic PEM fuel cell ...

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.

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 ...

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 ...

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 exposure standard for wireless devices employs a unit of measurement known as the Specific Absorption Rate, or SAR. Unfortunately the limits set by the FCC/IC and the Concil of the European Union ...

Here’s how it works. There's a lot of things to consider when searching for the best cell phone plan, from coverage to perks. But when I'm evaluating plans, the question I ultimately ask myself ...