I have iphone 4 and ios 7. iphone doesn't recognize my wifi at home frequently but my ipads which has old ios have no problem. how can I fix it?

I have iphone 4 and recently updated IOS to 7.0.4. After that, my iphone is keep going into 3G mode at home. I thought it was the problem with my internet or router. But my husband's iphone and our ipads are not having any issues. I turned off and turn it on many times. It eventually get the wifi, but it disconnects few times and it is really frustrating.
Also, it seems to me that the battery is dying quicker. Am I the only person having the issue?
How can I fix the connectivity issue? Or is there any way for me to go back to IOS 6? Some of appes don't work under IOS 7.
Thank you.

Hi yanylove,
If you are having WiFi issues after upgrading to iOS 7, you may find the following article helpful:
iOS: Troubleshooting Wi-Fi networks and connections
http://support.apple.com/kb/ts1398
Regards,
- Brenden

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