You can click on the above link and check with the details, requirement and supported mobile handsets for Windows 10 Upgrade
https://forums.windowscentral.com/e...ws%2Fwindows-10-mobile-upgrade&token=KXngs7Gf
If the upgrade is available for your existing Windows Phone 8.1 device, you can install the upgrade when available. We're working with phone manufacturers and mobile operators to make Windows 10 Mobile available to supported Windows Phone 8.1 devices as an update.
To check if the upgrade is available for your phone and install the upgrade, go to the Store, install the Upgrade Advisor app, run the app to see if the update is available, and then select Enable Windows 10 upgrade.
Notes
The availability of Windows 10 Mobile as an upgrade for existing Windows Phone 8.1 devices will vary by device manufacturer, device model, country or region, mobile operator or service provider, hardware limitations, and other factors.
Because of the size of the update, a Wi‑Fi Internet connection is required for download and installation.
For more info about the app, see Upgrade Advisor app for Windows 10 Mobile.
Regards,
Joseph Paul