You can find this on the device's sticker or through its management software.
Use any compatible SIM card from local or international providers to find better data rates. Gsm Multi-hub Modem Unlocker
Insert a SIM card from a different provider into the modem. When prompted for an unlock code, enter the one generated by the tool. You can find this on the device's sticker
Supports models such as the E156G, E156, E155, E1552, E160, and E1550. Gsm Multi-hub Modem Unlocker
While the tool is powerful, its compatibility is focused on several popular manufacturers: