Why is wifi issue when i upgraded my iphone4?

Hey am glad that you are using iphone4 and has beenupgrading its features and I would love to give you advise to solve yourwifi connection issue. I will guide you through some steps that will surelyresolve your issue;

First of all reset your network settings by going to touchsettings ->general ->reset -> reset network settings.

If you will still face the problem then follow these steps:touch settings ->general -> reset all settings.

Restore your iPhone as a new phone. This is a slow andtedious process but will reset your iPhone as if it was new from the factory.Although this should fix all of the above issues, you will have to reload yourcontacts and media onto the iPhone from the computer manually.

To restore you have to follow these steps:

First of all connect your iphone to your PC.

Then run itunes.

Under the summary tab select the restore.

Then if you wish select back up.

When this process is complete you can restart your iphone.

After this Set Up You iPhone screen appears select Set up asa new iPhone.

This will definitely help you in your issue.