It can be customized, mainly based on wavecom&Siemens module.
Q24plus, q2406, q2438, q23, q24, p5186
Mc388, mc55, mc56, mc45, mc35, mc39, tc35, tc35I and more

GPRS dual band (900/1800MHz): Q2406a, q2406b
GPRS dual band (850/900/1800/1900MHz): Q24 plus
CDMA dual band (800/1900MHz): Q2438j
Dual-band (850/900/1800/1900MHz): Gr64, p5186
That modules can support open at, TCP/IP protocol.

Main features: Industrial-grade chips, to ensure stable operation
Switch independence, support for the size of SIM card
Ports support hot-swapping
A separate module can be demolished.
Power lines and data lines are only one of the more simple.
The size of a small, elegant, accounting for a smaller space (the size of the computer keyboard is only about half the size), especially suitable for the use of multiple machines at the same time.
Electric power source: 110v/220v AC
Electric interface: Etsi standard