Hello and welcome to Android Forums tegil20
From your PM to me, I know that you are from Indonesia and the term, "Black Market", I believe, has a slightly different meaning to the European usage.
is quite right in saying that if you are unsure of your phone you should check the white sticker underneath the battery as well as typing in
into the dial pad which should give you the Version details.
You can also go to Settings
> About device
... and check the details under, Model number, Baseband version and Build number.
Below are 2 links for the Galaxy S4
, User Manuals, that may help you.
Galaxy S4 I9500 User Manual, Simplified Chinese (简体中文, for Southeast Asia regions), Jelly Bean
(Right click, choose save as to down the user manual in PDF format) Galaxy_S4_User-Manual_GT_I9500_Jellybean_Simplified_Chinese_20130 424
Galaxy S4 I9500 User Manual, Thai (Siamese, ภาษาไทย phasa thai), Jelly Bean
(Right click, choose save as to down the user manual in PDF format) Galaxy_S4_User-Manual_GT_I9500_Jellybean_Thai_20130417