My 830 was unlocked, too; but it also said "..We're working with your provider.." so while the phone is eligible, it hasn't been sent W10, yet. To-date, I don't think my former provider has still even sent W10 over the air.
I got the Windows 10 update by using the Windows Insider app.
Even when it's network unlocked (you can use it on any compatible network), you're still running the ROM from that original network (unless you've flashed it) and they are still in charge of pushing those OS updates, unless you bypass it with something like Windows insider.
Why go through the extra effort when you can just use the Windows Insider app? If you select Release, you can uninstall Windows Insider after W10 is loaded and you will be running production updates (no preview builds).
I was told that windows 10 was sent out for the 830 global unlocked and to give it a few hours. I also had a concern about getting the official update while it is still free. It was mentioned to me today when I called about my phone.
Yes, I downloaded the upgrade advisor. It states that it is working with my mobile operator and will send a notification.
Today when I called about this it was stated to me that they understood my urgency in getting the upgrade on my phone while it is still free and prior to the anniversary update.