Samsung galaxy S3 GT-I9300 4.3 Jelly Bean to 5.0-lollipop I would like to know if it is possible to update my Samsung Galaxy S3, which is in 4.3 Jelly Bean, to 5.0-lollipop. And in this case, I would like to know :


If it is a good idea ;
Will my phone support it ; 
What benefits it might bring me if it is possible.


I also would like to know the best way to proceed, to update my phone.

Thank you in advance.  

Edit : I have a friend that has the same phone, and his phone updated itself. Why not mine?
Yes, it's a good idea.  
Yes, your phone will support it. I've seen ROMs for the S3 (i9300) up to 5.0.2.  
Benefits include: security fixes, better stability, improved battery life, new features and a lot more!


To update your phone, I would suggest 


rooting it (there's a lot of information on rooting over at the XDA Developers Forum,
flashing a custom recovery like CWM, and
installing a custom 5.0.2 ROM. There are lots of them on XDA, so I'd spend a little time having a read up on the various functionality available.


As for why your friend got the update: it's possible that he has flashed a custom 5.0.0+ ROM also.