Sixfab Frequency Band Support

I am planning to deploy an IoT gateway by MQTT protocol. Either LTE or NB-IoT is fine.
How about this NB-IoT Module and 3G/4G&LTE Base HAT?
Does it support NB-IoT(900Mhz or 1800Mhz) and LTE CAT-4 Band3(1800MHz)?

Several variants of the Quectel EC25 modules support LTE CAT4 Band 3, which works with Sixfab Base HAT. Please check the product page for further details.

The Cellular HAT supports LTE FDD: B1/B2/B3(1800MHz)/B4/B5/B8 (900 MHz)/B12/B13/B18/B19/B20/B28

This HAT contains the Quectel BG96 module, make sure, your SIM provider approves its compatibility.

MQTT guide.