Unable to Turn on Data connection and Wifi after the update of Windows 10 Preview

Unable to Turn on Data connection and Wifi after the update of Windows 10 Preview and the SMS outgoing and incoming is barred.

Hard reset your phone and see if that fixes it.

If not then use this to go back to W8.1 - How can I recover/reset/restore my phone software? - Microsoft - UK

This works:
1. Make a backup
2. Factory reset your phone
3. Restore the backup