Well. Ya could argue its still a "computer". Just flashed n reinstalled custom rom on my sg3s. Cyanogen. Used helium (an app) to back up my data. N it worked great. Since I data wiped. Cleared cache/dalvic cache factory reset the lot. And now. No freezing. No slowing down.

Note though. If u think of doing this read up several times. Always always BACK UP YOUR DATA. Can't stress that enough. U need to firstly root your phone for super user access . U can use Odin or similar app for your phone. Pretty much does all your android based. This can be used to unlock your phone to other networks too.

But. Be careful. N don't brick ur phone. If u don't 100% know what ur doin. Don't do it. Simples!