AVM's advanced ADSL2+/WiFi-routers with integrated VoIP-ATA and PBX, Fritz!Box Fon 7240 and 7270, can connect to the internet through USB-modems attached to their USB-interface.

specifications

manufacturer:	AVM
model:	Fritz!Box 7240/7270
3G integrated:	- (external USB-modem required)
GSM frequency bands:	-
UMTS frequency bands:	-
HSDPA:	-
HSUPA:	-
EDGE:	-
GPRS:	-
CSD:	-
connector for ext. antenna:	-
connector type:	-
internal antenna diversity:	-
voice telephony:	7240: VoIP through integrated ATA/PBX (lacks PSTN/ISDN support of 7270) 7270: VoIP & analogue PSTN or ISDN through integrated ATA/PBX
extensions:	7240: 2 analogue extensions up to 6 DECT cordless phones. 7270: 2 analogue extensions up to 6 DECT cordless phones internal ISDN S0-bus for ISDN phones
WiFi:	802.11n with up to 300 MBit/s
WiFi antenna:	3 MiMo antennas
connector for ext. WiFi ant.:	- (U.Fl. Hirose connectors inside)
WDS support:	+
LAN:	4 x RJ45
extras:	ADSL2+ modem PBX for simultaneous use of PSTN or ISDN and VoIP

supported USB-modems

• Huawei E160, E160G, E160E, E160X, K3565(-H)
• Huawei E161 (requires deactivation of flash memory by AT-command: at^u2diag=0)*
• Huawei E169, E169G, E169V, K3520
• Huawei E170
• Huawei E172
• Huawei E1762(requires deactivation of flash memory by AT-command: at^u2diag=0)*
• Huawei E176 / T-Mobile web'n'walk Stick IV
  
• Huawei E220
• Huawei E272
• Huawei K3715
• Huawei B970 / T-Mobile web'n'walk Box IV
• Novatel Wireless Ovation MC950D
• Option GlobeSurfer iCon HSUPA
  
• 4G XS Stick W12
• ZTE MF 622
  

*) based on AVM Fritz!Box Firmware version XX.04.80

Weblinks
thread about supported USB-modems on ip-phone-forum.de (German)
manufacturer's English product page: http://www.avm.de/en/Produkte/FRITZBox/FRITZ_Box_Fon_WLAN_7270/index.php
manufacturer's German product page: http://www.avm.de/de/Produkte/FRITZBox/FRITZ_Box_Fon_WLAN_7270/index.php (mentions support for UMTS USB-modems)