Can I use tails for Android and PC?

To use tails for Android and PC, you would need a custom image to boot from in order to install those, and currently I know of none that are specifically designed like tails is. If you had the necessary programming skills you could modify the Tails OS and MAKE it compatible with your tablet specifically, but that includes learning what hardware your tablet uses. specifically the CPU and then learning ARM assembly(Most Likely). The BIOS is just firmware that loads the OS, so yes at some point, once you have the custom image you would need to boot from the image which the BIOS would help you do. If you're interested, Offensive Security, the creators of Backtrack and Kali Linux have released a custom OS for certain NEXUS devices. It's called Kali Nethunter, and while its targeted specifically for conducting penetration tests with mobile devices, it could most certainly be used to route your connections through tor/i2p/vpn etc, thus mimicking the effects of TAILS, Although I should mention that NetHunter runs inside of its own session.