In the past, it was common to send greetings by mail or telephone. Today, communication without mobile networks and SIM technology is almost unimaginable. Giesecke+Devrient (G+D) highlights the key ...

There are three basic types of physical SIM cards: standard, micro, and nano. Steves explains that many phones — particularly iPhones — use the two smaller options, micro and nano. Luckily ...