By wireless router do you mean the ability to use your phone as a modem or the HD2's ability to act as a WiFi router for your laptop? You can teether most mobile phones and use them as a modem for your laptop. Nokia phones with 3G bands, Samsung phones, and even the iPhone. As for using your mobile phone as a WiFi router, you need a mobile phone with WiFi capability and preferably 3G connection, this can be done through a software. With an HTC or windows mobile phone such as the HD2, there's a free application for that, so with the iPhone (though I don't know if it's free). With Nokia phones, you can use joikuspot.