I have been using a D-Link DSL-2730U modem for over a year now. This modem served a desktop PC (connected directly from the modem to PC's LAN card), a laptop, and three smart phones (by wi-fi). None of us had any problem in accessing the internet from the PC/laptop/smart phones. About 10 days ago, one of the mobile phones (Sony Ericsson minipro) stopped getting the wi-fi connectivity from this modem, though the others continue to get the wireless or the wired connectivity. This mobile phone picks wi-fi connection from modems belonging to my friends when I visit them and am able to get my e-mail or use the browser for searching. This shows that there is nothing wrong with the mobile phone, and the problem is only with the modem.
However, when I switch off the mobile phone and again restart, at my location where the above-mentioned D-Link DSL-2730U modem is available, the phone (Sony Ericsson minipro) gets the wi-fi connectivity for about 2-3 minutes and then gets disconnected. As a result of this, the modem was re-configured to see if the problem could be rectified. Unfortunately, the problem has not been resolved, and the mobile phone still does not have the wi-fi connectivity.
Can somebody suggest ways to correct this problem?