If you’re like most people, you probably spend a great deal of time away from your home Wi-Fi network. Free open Wi-Fi networks can be few and far between these days so if you have an iPod touch, a MacBook, or even an iPhone this can be inconvenient to say the least. There are solutions available to help (like the MiFi 2200) but if you already have a USB 3G modem or a phone that supports tethering, there’s no reason to pay twice for data access.

The Cradlepoint PHS300 personal Wi-Fi hotspot can take your existing 3G device and create a personal WiFi hotspot to connect other devices to the Internet. 

The CradlePoint is a compact, rechargable-battery powered Wi-Fi router. 

The device works with practically any USB modem or tethered cell phone. We tested our PHS300 with a Sprint Sierra Wireless Compass 597 USB 3G dongle. We plugged it in and the CradlePoint automatically recognized our device and created a WiFi hotspot. No additional software is required to use or access the CradlePoint, which is administered via a web interface like a standard router.

Security can be as simple as a password or more advanced using WEP/WPA/WPA2 security. The replaceable Li-ion battery can pump out a Wi-Fi signal for a little more than three hours. It can also run off AC power, with or without a battery connected. A case ($15), extra batteries ($25), and car power adapter($25) are available as optional accessories.

The form-factor was a bit cumbersome, with the USB modem hanging out of the side, but certainly not a deal-breaker. And we definitely like the ability to change  cellular providers or 3G devices without having to buy a new Wi-Fi device. Cradlepoint frequently updates the firmware, so it works with a growing number of 3G modems and cell phones. We’re still waiting for AT&T’s mythical tethering plan to materialize, so no word yet on iPhone compatibility.