These are the phones that can update to Windows 10. If you don't have one you won't get the update.
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
Also the anniversary update hasn't been released for mobile and won't be for a few weeks.