Your Safari version is
What version of Safari am I using?
Version of the Safari browser installed on your system can be checked in a few easy steps:
1. Open your Safari web browser.
2. Click on Safari in your Safari menu, located at the top of your screen.
3. In the drop-down menu choose the option labeled "About Safari". A dialog box will now appear containing the browser's version number. The first number is the major version of Safari, the number inside the parenthesis is the build version.
Note: on the iPhone all standard software is bundled together. This means that you do not have to worry about the Safari version since it is updated with each new version of the operating system.