Compare 3Com Megahertz 56K Cellular Modem Analog Modem (3CXM556) to 3Com U.S. Robotics Internet Call Analog Modem (USR325695)

The 3Com Megahertz 56K PC Card (Cross Platform Support PC/Mac) sets the pace with the built-in V.90 56K technology and light-speed downloads over regular phone lines. In addition, you'll enjoy market-leading features like Mobile Speakerphone, Caller ID and Phone Answering, which turn your notebook into a portable telephone. ??This model also features an X-Jack connector, the easiest way to connect to any standard phone line. With the X-Jack, you avoid the hassle of carrying and losing cumbersome cables; simply pop it out to hook to any standard phone cord then lock it back in for safe travel. It is cellular capable and connects directly to cellular phones with a separate cellular cable. ??Additional features of this model include Flash DSP which allows you to update your modem's main functionality without returning it, using simple software downloads. It also features Flash ROM to perform basic enhancements to your modem with software updates from the field. This model has an intel... Less

The U.S. Robotics Internet Call Modem adds sophisticated online call management and economical Internet voice call capabilities to a powerful, easy-to-use internal faxmodem. You're in control of your time online. When an incoming call arrives, a pop-up window tells you - you decide whether to end your Internet connection and take the call, or ignore it and stay online.??You can make live, real-time, full-duplex phone calls while you stay online, with Net2Phone Internet voice call software. It's just like making a traditional long distance call, but at a lower cost - calls to anywhere in the U.S. and Canada are free! With a telephone connected to your modem, you can call any phone in the world over the Internet. You can also use your modem's Internet connection to send faxes, call another PC, send voice e-mail, or enjoy live voice chat. And because the advanced voice call functionality is built into the modem, you can speak and listen through your telephone instead of your computer ... Less