Greetings, caue_silva.
I see that you're unable to change the volume of your iPhone using the Control Center. Even when you long-press the volume icon, the volume doesn't move, and I'm glad to help with this.
Access and customize Control Center on your iPhone and iPod touch -- Try again to adjust the volume from the Control Center. If it doesn't move force restart your iPhone: Force restart iPhone. Once you're back to the Home screen, see if you can adjust the volume from the Control Center now.
How to back up your iPhone, iPad, and iPod touch -- If you still can't control the volume from the Control Center, please be sure to have a fresh backup to keep your personal information safe.
If you can't update or restore your iPhone, iPad, or iPod touch -- I'd like for you to reinstall iOS. The section titled "Put your device in recovery mode and set it up again" will walk you through all the steps to reinstall iOS software on your device. Test the issue again when the process has completed
Let me know how that goes.
Take care.