AT&T
RECOMMENDED SIM:
AT&T LTE-M (Orange) 310 170 IMSI, IoT, Micro-3FF (SKU: G0727)
https://marketplace.att.com/products/att-iot-dataplans-lte-m-us
Verizon
RECOMMENDED SIM:
VZW CAT-1 & Above, Triple punch, Micro-3FF SIM (SKU: M2MSIM-DF-D)
https://thingspace.verizon.com/iot-marketplace/
T-Mobile/Sprint
RECOMMENDED SIM:
- Magenta, Size: 3FF/Micro, 4G R12 IoT SIM (SKU: TM9263)
- Magenta, Triple Punch, 4G/5G R15 IoT SIM (SKU: ZZZ260R070)
OR
Contact your local reseller.