Iphone 4 won't connect to home Wi-Fi? - 1

I have an iphone 4 and it won't connect to my home Wi-Fi. I have connected to other Wi-Fi but it has been limited. I connected at a local cafe and was able to play an app game that requires Wi-Fi but wasn't able to use safari. But at home my Wi-Fi won't work i just get the error message Unable to join the network… I have tried everything. Trying to connect while on areoplane mode, reset my router and modem, changing my mac address, resetting connection settings on my iphone. Nothing works it's so frustrating. I have ios 6.1.3 on my phone. I can't upgrade due to lack of space on my phone it is over a gig to upgrade and i only have a 8 gb phone. If you have any ideas on how to fix this i would really appreciate it.

Unplug the power to your Wi-Fi unplug it for about 2 mins
then plug back allow 5 mins to reset

Two ways to solve your problem:
1. Reset your modem password.
2. Replay the router like cisco 880 series which has fast speed and wide limit
Soruce:
http://www.router-switch.com/Price-cisco-routers-cisco-router-800-series_c74

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