Can't connect to Wi-Fi on iphone 4?

Hey so for over 2 days now i can't connect to my Wi-Fi at home.
I have no idea why it isn't working but it is driving me crazy. I've went to my provider and they don't even know what to tell me. Basically when i go to my Wi-Fi, nothing shows up and there are no networks to chose from. However, if i go to my friends house or to school, my Wi-Fi works fine. My phone is still using the OS 5.1.1 and isn't updated. Is there anything i can do to get my home Wi-Fi back on my phone?

The problem is not with your phone but it is with your Wi-Fi connectivity. It's sad that your provider was unable to come up with a solution for you when its HIS JOB to do so. I would consider talking to your provider again and specifically ask them what your options are to get your Wi-Fi back up and running. Also you want to consider going to WalMart and buying a new router box. They aren't super expensive, mine works great and only cost like 30 bucks. If that doesn't work then return your router.