How to setup Telstra TURBO MODEM™ with DrayTek Vigor2910 series
the vigor2910 supports a nextg USB modem as a failover if its ADSL interface goes down.
Billion Products for SSL VPN, ADSL Modem/Router, Wireless ADSL Router, Powerline ADSL Router and Adapter, VoIP ADSL Modem/Router, Security Router, Broadband Router, SHDSL Bridge/Router, iBusiness Security, ISDN Product
The billion 7300GX is a ADSL2+/HSDPA router
The Linux GPRS HOWTO
probably also useful for UMTS/3G
SMS Tutorial: Introduction to SMS Messaging/Short Message Service, Concatenated SMS/Long SMS and EMS
the start of an interesting tutorial on SMS
May 2008 AT commands for Sony Ericsson phones
sony ericsson doc listing they AT commands available on their phones