Working in Singapore mobile network.
Specs:

1. 1 SIM card slot
2. NB-IOT connection, 26.15 Kbps download and 62.5Kbps upload speed.
3. 1 antenna port
4. Serial UART AT command
5. supply voltage needed : 2.1V to 3.6V
6. Support Power Saving Mode (PSM) and Extended Discontinuous Reception (eDRX)
7. Current consumption
500mA Peak
200mA Connect to base station
5uA in PSM

8. Mobile module dimension: 17.6mm x 15.7mm x 2.3mm
9. SIM7020

Mobile network support:
Bands : B1, B2, B3, B4, B5, B8, B12, B13, B17, B18, B19, B20, B25, B26, B28, B66, B70, B71,B85

Functions:
SMS : Text or PDU
TCP/UDP
FTP/HTTP/HTTPS/SSL/DTLS
MQTT