The MGSM breakout designed by 7Semi, integrates Quectel's M66 which is a Quad-band GSM/GPRS engine that works at frequencies of GSM850MHz, EGSM900MHz, DCS1800MHz and PCS1900MHz. The M66 features GPRS multi-slot class 12 and supports the GPRS coding schemes CS-1, CS-2, CS-3 and CS-4. The board uses 5V to 15V DC power supply. The board features internet service protocols, such as TCP/UDP, FTP and PPP. There are extended AT commands developed to use these Internet service protocols easily.

DATA SHEET : https://evelta.com/content/datasheets/027-Quectel_M66_Datasheet_V1.2.pdf