@Viss @ai6yr I've been using Google Fi SIMs for a while for backup internet.
This is a mobile router I bought in 2022: GL-X750V2 (Spitz). It has worked well with Google Fi SIMs and connects to my UniFi WAN2 port.
More recently I've been using a Peplink router with both Peplink and Eiotclub eSIMs for travel. It's overkill but useful with four external 5G antennas and a USB-C power cable:
- Peplink BR1 Mini 5G (with WiFi) (MAX-BR1-MINI-5GN-T-PRM)
- Peplink 4-pin to USB-C power cable (ACW-791)