I recently purchased an Acer Swift 3 SF313-51 with built-in cellular modem. I fired it up and it spend hours doing updates. When it finally finished, I shut it down and popped in a SIM card for my Google Fi cellular account.
The SIM had been working in an Android device in the same physical location. In the Swift 3, Windows 10 reports that it's connected to T-Mobile but also shows "No service" below that, so it would seem that Windows 10 is seeing the cellular modem and the SIM card, and talking to the SIM enough to be able to recognize that it's on T-Mobile (Google Fi leverages T-Mobile and other networks).
I thought perhaps it was missing APN information for Fi, so I added that to the Windows 10 settings using the same info I've used for Android devices. This did not change anything. Windows 10 still reports "No service".
Elsewhere online, I've seen people report that they were unable to make a cellular connection from their laptops with the built-in Windows to CDC MBIM drivers and had to revert to the drivers provided by the laptop manufacturer. I've downloaded those drivers from Acer and tried to install them, but Windows refuses to use them, always preferring the built-in Microsoft driver over the Fibocomm driver provided by Acer.
So far, I've tried without success:
1. Rebooting the laptop (multiple times).
2. Removing and reinsert the SIM.
3. Attempting (and failing repeatedly) to load the Fibocomm 4G drivers from the Acer support site for this model. Windows always says it couldn't find a relevant driver or that it had a better one already.
4. Adding APN information, and when that didn't work, changing the few settings there are to see if that made a difference (e.g., IPV4 to IPV4V6).
5. Verifying that all the latest Windows updates are applied.
If anyone out there has successfully connected their Swift 3 to Google Fi, I'd appreciate some guidance...