Wireless internet not working on mobile devices?

So we usually have my computer, phone, ipod & my family member's phones, ipods, computers etc connected to our wireless internet, joining automatically. However this morning i noticed that my ipod wasn't connected to the wireless, i then realised that my phone (samsung galaxy s3) wasn't either and my sister's iphone wasn't either anymore. Now when we try to connect with these types of devices it says unable to join "router name" and on my phone it says authentication failed. I tried 'forget network' and re-joining but i get the same errors. However the internet on the computer the router is joined to is working & the wireless on my laptop is working. The router is a belkin & no settings have been changed recently.
Any ideas?

Go into your router's settings and confirm everything looks properly configured. There's a slim chance that a power surge can wipe the router's settings if you don't have a UPS connected to it. What's the background radiation between line of sight -- does someone have a microwave constantly running between floors?

If it has an encryption set where you have to use a password there are some phones have a issue with that. I had a issue with my Galaxy Y for a while because the encryption that my School used the phone did not support. So what you should do is find the information and encryption type (WPA/WEP etc) and manually put that information in and see if it works.

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