Today, there are a wide variety of mobile phones available in the market, beyond the two most popular operating systems: Android and iOS (iPhone). These alternative mobile phones, while not as widely known, offer unique features and capabilities that may be just what someone is looking for.

1. BlackBerry BlackBerry, once a giant in the smartphone market, still has a dedicated following of users. Its signature physical keyboard and strong security features make it a popular choice for professionals and those in the security-conscious industries. The latest BlackBerry models run on the Android operating system, offering a blend of classic BlackBerry functionality and access to the Google Play Store.

2. Windows Phone Microsoft's Windows Phone operating system was once a major player in the smartphone market, but has since lost significant ground to Android and iOS. Nevertheless, Windows Phone still has a dedicated user base, particularly among those who use Windows-based computers and want a seamless integration between their mobile devices and PCs.

3. Sailfish OS Sailfish OS is a Linux-based operating system developed by Finnish company Jolla. It offers a unique gesture-based user interface and access to the Android app store, allowing users to run Android apps on their Sailfish device. Sailfish is designed with privacy and security in mind, making it a good option for those who value control over their personal data.

4. Tizen Developed by Samsung, Tizen is a Linux-based operating system that is used in a variety of devices, including smartphones, smartwatches, and smart TVs. Tizen offers a simple and intuitive interface, as well as access to a growing number of Tizen-compatible apps through the Tizen Store.

5. Firefox OS Firefox OS was a open-source operating system developed by the Mozilla Foundation, the organization behind the popular Firefox web browser. While the project has since been discontinued, some Firefox OS-powered devices are still in use, and the operating system's focus on open web standards and decentralized data storage continues to attract a niche group of users.

6. Symbian Symbian was once one of the most widely used smartphone operating systems, but has since declined in popularity. Today, it is mostly found on older Nokia devices. Despite its age, Symbian still has a dedicated user base, particularly in developing countries where it is used as a low-cost alternative to more expensive smartphones.

In conclusion, while Android and iOS may dominate the smartphone market, there are many alternative mobile phones available that offer unique features and capabilities. Whether it's the classic BlackBerry keyboard, the seamless integration of Windows Phone, or the privacy-focused Sailfish OS, there is a mobile phone out there that fits the needs of just about everyone.