Well, I'm not entirely sure. I have bad service in my home so I can never get data connection or mms. So I can't say anything about the internet or mms. I think they'd proly work though.
I've noticed a few things:
First, the phone does not have a lot of the JoyOS apps, so that could be increased on.
Second, holding home down crashes the rom.
Third, there is some lag, but overclocking seems to fix it.
Fourth, voice search does not work. Fixed by deleting by TB and reinstalling using the Play store.
Fifth, there are some instances with the chinese text, but much, much less than ThatGuyLurkings.
Sixth, in comparison to ThatGuyLurking's, I'd say they're about even. ThatGuyLurking's OS feels much more like the iOS than this one, but this one's performance bests ThatGuyLurking's.