Microsoft began with the release of the release version to mainstream of Windows 10 Mobile Anniversary Update.
Those who have unlocked Windows Phones that support Windows 10 Mobile can download and install the RTM Build 14393.67 version from today. (Those who are registered with Windows Insider on Fast Ring already have build 14.393,67)
Those who have locked devices will have to wait until the providers have the update available.
Microsoft states:
To manually check for the update, you can from the Start, Όλες οι εφαρμογές, στη συνέχεια, Ρυθμίσεις – Ενημέρωση και ασφάλεια – ενημέρωση Τηλεφώνου – Έλεγχος για ενημερώσεις.
“Please note that availability may vary by manufacturer, model, country or region, την εταιρεία κινητής τηλεφωνίας ή το φορέα παροχής υπηρεσιών, τους περιορισμούς του υλικού και άλλους παράγοντες.”
Eligible devices Windows Phone who can get Windows 10 Mobile are: Lumia Icon, 1520, 930, 640, 640XL, 730, 735, 830, 532, 535, 540, 635 1GB, 636 1GB, 638 1GB, 430, 435, BLU Win HD w510u, BLU Win HD LTE x150q, MCJ Madosma Q501 - plus any newer phones like the Lumia 950 and 950XL that were already released with Windows 10 Mobile.
If you can't find it device in the above models, take a look at the link below and proceed at your own risk:
Install Windows 10 Mobile Anniversary Update on every device