The
MikroTik RB751U looks like a good industrial-strength router.
I've used an RB411U previously with good results, it has SMS support and USSD is possible.
It can also supply up to 2.0A on the USB port.
Bought one of these MikroTik RB751U's a few days ago, with the objective of having two simultaneous active inbound connections to my DVR camera system for redundancy purposes.
Learning curve alert!!!
Anyhow, a few late nights, many hours and much surfing later, I now have a PPPoE connection via ADSL (TelkomInternet) and a PPP 3G (Huawei K3765) connection (Vodacom unrestricted APN) both active and simultaneous inbound video viewing via both connections, tested from two mobile phones at the same time.
Each connection registers its own unique DDNS host name and uses scripts to update any changes.
Had to scratch around with port forwarding and "Mangle" rules to mark traffic, so that whatever comes in on a wan port, goes back out of the same wan port.
Also have GPS vehicle tracking (GPRS 1min updates) running with port forwarding to a laptop over the wireless connection, as well as a WDS bridge from a TP-LINK 1043ND sharing a USB drive for clients on my network.
The RB751 also serves as a general AP for other wireless devices.
A bit complicated to get your head around at first, but yeah, as ginggs says, a pretty powerful little router.
I just get the feeling that I have hardly scratched the surface of its capabilities
(Dust bunnies accumulating on the old TP-LINK MR3420....:erm: )