Where can i find my Model numbers Just wondering how do I find which model number my galaxy s4 is? I see people writing Gt- numbers.  I can't find anything like that. Any help would be greatly appreciated Thanks
Note that not all S4 models start with "GT" - see a not-so-complete list of variants here.

You could either see it under Settings - About phone - Model number (in this example, SCH-I545):



Or on the sticker underneath the battery (in this example, GT-i9505G):