The SIM (= Subscriber Identity Module) card identifies the user in the network. All GSM-based phones use the same size of chip, but the plastic frame around it, comes in 3 different sizes: Mini SIM (= 2FF): 25 x 15 mm. This used to be the standard for many years from 1996 and still is the most common size around. Micro SIM (= 3FF): 15 x 12 mm. Beginning with iPad and the iPhone 4 in 2010, this sma...

Recently, the iPhone 12 series,the world's smallest, thinnest, and lightest 5G mobile phone is coming. A significant change of iPhone 12 is the support of MagSafe magnetic wireless charging technology. The device is accurately positioned and paired with the wireless charger through the attraction of magnets to improve charging efficiency. However, as everyone knows, there no longer comes with a ra...

Nowadays, as a law-abiding citize,would you want a spy camera? Well, spy cameras or micro cameras can have loads of non-nefarious functions, and as they come in all sorts of different forms, you don't have to be James Bond to find a use for one. The best spy cameras are tiny, unobtrusive little devices that are nevertheless capable of recording high-quality videos. So, whether for home s...

Today, let’s talk about grill-brush（BBQ Brush）.   One of the most practical tools used before or after every cookout is a grill brush.  Most people leave their grill brush hanging on their grill where it is always accessible.  That means their trusty grill brush takes a real beating from frequent use and the weather.  In normal use, we apply pressure to vigorously brush off bur...