my iphone wont connect to my wifi!

[maddog12]

ok so i used to be able to connect to my wifi at home. And now i cant anymore.
I went to the apple store for help and they had a look n it connected to there wifi so it wasnt the wireless on my phone. My boyfriends iphone will connect to my wifi though and mine wont? so i dont get it. i have tried everything on the planet and i really need help. So anyone with any suggestions please tell me!!
much appreciated!
thanks for ur time :)

[Phoenixian]

The Iphone kept asking for the password to my in-home wireless network.....none of the other wireless devices I use had issue.

I rebooted the modem and the wireless (airport express) router and the problem disappeared.

I know you said you've done everything possible; give it one more try?