software mobile connectivity: Huawei E3531 | Details | Hackaday.io
Unlocked Huawei E3531 E3531s-2 HSPA Data Card 21Mbps 3G Mobile USB Stick Hilink Modem USB Dongle Modem - China 3G USB Modem and 3G Surf Stick price | Made-in-China.com
Original Unlocked HUAWEI E3531 3G WCDMA HSPA+ 21Mbps USB SurfStick Modem Dongle