TCP/IPv4 properties not accessible.

You can change that only in Windows 10 Pro/Enterprise, not home.

 

I have the same problem since RTM and pre-RTM, but in 10547 it's working now....

 

Could you try this in elevated command prompt

Code:

net user administrator /active:yes

and login at the administrator account and see if you can use properties on your ip4

 

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Well I would not expect that would work, since as you rightly say it is not a VPN connection.
But that aside what exactly did you change in the rasphone.pbk configuration file?
It's divided up in sections where each VPN connection has it's named enclosed in brackets, for example:
[Company VPN]

But you can try with Powershell, lanuch it as admin and then look for your adapter:
Get-NetIPAddress
Look for your interface and then change it with the following, replacing the name in brackets and DNS to what you prefer, the ones I've shown are for Google's DNS.
Set-DnsClientServerAddress -InterfaceAlias “Mobile Broadband Connection” -ServerAddresses 8.8.8.8, 8.8.4.4