Every time I try to connect to mobile broadband on my Surface 3 I get an error message that says, "Can't connect to this network. Enter an APN and try again." I have AT&T service. In my search for an answer, I did find an APN settings list by device
type on the AT&T website. They have iPhone and Android settings and when it comes to Microsoft it says that Windows devices update these settings on there own. There is a Default APN, which is what I have applied under the Advanced Setting for the mobile
broadband which does not seem to work. I have called Microsoft and they were unable to help. AT&T has access to the same information as I do. Is there anyone out there that can actually help? The people that make the product and provide the service certainly
can't.