Conflict is brewing in the mobile world over the adoption of a new, smaller standard for the SIM card — the chip in each GSM phone that dictates which network you connect to and your cellphone number.

Just in case a micro-SIM card is too bulky for you, Germany’s Giesecke & Devrient (G&D) has announced a nano-SIM card, which is about 30% smaller than the micro-SIM and 60% smaller than a SIM card.

As the iPhone Air goes eSIM-only, and some of the best Android phones also drop the SIM card tray, here's a look at the eSM, ...

4FF stands for 4th Form Factor. A SIM card that is simply physically smaller than a traditional (2FF) SIM card or Micro-SIM (3FF) card. See: SIM The electric contacts and circuitry of a Nano-SIM are ...

Apple has been striving to get its new Nano SIM card design approved as the industry standard, while companies like Nokia, RIM, and Motorola have been advocating for an alternative design. The ...