This requires hardware (Blu-ray drive) and technical know-how, but the quality is unmatched.
There are several websites that offer 7.1 Tamil Mp3 Songs Free Download. Here are some of the best ones: 7.1 Tamil Mp3 Songs Free Download
No. Your phone and standard earphones are stereo (2-channel). A "7.1 MP3" will just play as stereo. For virtual 7.1 on headphones, you need a phone with a built-in surround processor (e.g., Razer Phone, Asus ROG) or external DAC/amp. Asus ROG) or external DAC/amp.