My iPhone 5c Wi-Fi will not connect?

I got my iPhone for Christmas and whilst setting it up I tried typing in my Wi-Fi password and it just keeps saying its wrong. I'm sure it's not because i have been copying it off the router it's self. I googled it and it was suggested to reset my network settings. It worked the first time but when I leave my house and come back I have to do it all over again, it is beginning to bug me, as every other device connects accept for my phone, does anybody have a solution?

Unplug the router wait thirty seconds and plug it back in. Connect to Wi-Fi and make sure ask to join networks is enabled to remember password. If password does not work call carrier for default password or a reset.