You could have tried closing down everything, the modem, the router, and the ps3. After turning it back again, nothing, still no connection. Your friends have claimed it worked for them, but somehow it didn't work out well for you. Is there something wrong with my ps3? or my modem and router? Do I need to get a replacement router or modem to get rid of ps3 80028ea7?

PS3 Error Code 80028EA7: Solving this mysterious issue

First things first, check if your modem is working fine. Usually it has visual indicators on the front panel to indicate whether data is coming in and out of your system. Better yet, try to connect your modem directly to your ps3 console and check if there is an improvement.