Out of curiosity, where did you go exactly? Do you have a band 71 capable device? Almost all of T-Mobile's new coverage in north NorCal is band 71, Sprint has totally ignored the area for ages. US Cellular is usually pretty good up there, if your phone has band 13.
I got this email from Sprint:
You’re just a few steps away from a better network experience with Sprint and T-Mobile. Improve your coverage now by reconnecting your Sprint Magic Box to your home internet.
My MB Gold is currently on Wi-Fi working just fine, so wondering if this a general spam sent to all owners, or does this process to re-select Wi-Fi force it update its config in some way.