Send the following on WhatsApp
Continue to ChatUpdated: The build 8.15.12492 is Windows 10 for Phones build under internal testing https://nokiapoweruser.com/advanced-windows-phone-8-1-build-reveals-itself/
Updated: The build 8.15.12492 is Windows 10 for Phones build under internal testing https://nokiapoweruser.com/advanced-windows-phone-8-1-build-reveals-itself/