Android

Android is so powerful, you can do things that other mobile operating systems are not capable of. There are no real limitations to what you can do with Android.

Android is a great operating system for mobile, and the market leader in terms of number of devices. Google's penetration into the market, though, as opposed to shipping a stock android without Google, and allowing customer to choose what apps they want, is disappointing. This is quickly solved by using LineageOS or another custom ROM, developed directly from the Android Open Source Project.

Google used Unix and renamed it Android. Now it profits off of contributions of open source programmers that made Unix and Gnu/Linux. Don't be fooled people, Google just took Linux kernel and added touch support and most importantly "Play store" where developers could make little money and be forced to make their apps free because Google planned it that way. Fast forward a couple years and the whole world is using android, people like those free apps, but they don't realize Google is profiting big time by adding their uninstallable bloatware like Chrome browser. The only way to uninstall Chrome browser is with root access which voids warranty. This is textbook Microsoft people! They did the same thing with Internet Explorer in the 90s. They force consumers to use their product, but the average consumer is unfortunately too dumb.

If you buy a phone like a “normal” person you will get a locked android version bundled with a ton of Google spyware (among others) with many proprietary software components.

If you extirpate the non-free part by installing a custom ROM (provided the phone manufacturer has not prohibited you to do so), many (non-free) applications will break and stop being compatible.

For instance Trust is abused to prohibit users to run certain applications by “attestation” that you have a phone as it came from the factory; forcing you to not change the OS. All this courtesy of guys like https://trustedcomputinggroup.org/ (better said Restricted Computing Group) who fight every day to take away the ability to control your own computer.

Do not be fooled, in the practical sense Android IS proprietary software. And thanks to the monopolistic practices, there are no other choices than Apple or Google for “normal” people.

The Best OS for smartphones, Its open source too.

in it's AOSP (Android Open Source Project) pure form it's a staple OS for smartphones. unfortunely, what many people don't realise is they don't have the original AOSP operating system in their smart phones - barely anyone does.

they are running modified proprietary versions tweaked by the device's manufacturer, bundled with proprietary google apps (and some times the manufacturers') without giving you the option to get rid of them, much less the back-bone of google apps: the Google Services Framework which will keep track of most activity on your device and send it back home to google servers

Highly customizable and easy to use.