An e-sim (also called embedded-SIM) is a SIM card that is built into a device (phone, tablet) and which is remotely programmable. This makes it easy to change the provider without having to change a SIM card. It is also possible to use one subscription over multiple devices: So 1 subscription You use for your smartwatch, your tablet, and your smartphone. And if you want a different subscription then you simply move on.
However, that is the translation from English. Nowadays, jailbreaking means cracking your hardware so you can do more with it. Since the advent of the IPhone, jailbreaking has become popular. Normally, the hardware (IPhone) is equipped with an operating system with limited capabilities. In the case of the iPhone you can only install applications from the itunes Store, after jailbreaking you can also install applications that are not in the itunes store. Jailbreaking is a fairly harmless process: a number of operating system files are modified (and can be rolled back if desired). The biggest reason to jailbreak is because more is made possible. When the APP store offers enough software, it is not necessary for most people to jailbreak their phone. Https://www.youtube.com/watch?v=zEbCzkcrXJk
Like BlackRa1n, Redsn0w is a cross-platform jailbreaking tool (for Apple iPhone). In addition it regulates immediately the installation of Cydia and the program for unlocking the SIM card. Redsn0w works from both an Apple OS and a Microsoft Windows OS. Read More