First a question or a couple of questions. Did you recently get a phone update like to Jelly Bean?
What model of Modem-Router do you have?
The reason I ask the first is because its a common problem that the JB update does not play nice with a certain number of routers or modems. you can however try the following:
Turn off your modem, router and cell phone and leave them all off for a few minutes. Then turn the modem back on and let it cycle back up fully. Then do the router same way. Then power up your cell and when fully powered up go to your WiFi connections and search for your home network name, then click connect and enter your security key. If it connects with no problem you are all set.
Secondly, if this does not work you can see if your router needs a firmware update. If the update works your issued is solved. But if you go to google and in the search bar list your modem or router as "My xxxxxx router does not connect to my phone after the Jelly Bean update" it will tell you if its one that is not supported. You then can buy a new router or if supplied by your dsl or cable provider they can give you a update router or modem.
Hopefully this will be easier for you? You can also enter the routers etc not supported in the forum search box for the list. Good Luck
