Phone no longer working on all wifi networks

I can't say this is a ios4 issue, but in the last few days my phone has stopped working with my home wireless network, but works over the office network. My wireless router is a Netgear Rangemaster. Other devices like ipads and macbook are working fine on the home network and the iphone used to be perfect as well, before and after upgrading to ios4.
I have tried re-booting the phone and sometimes when it powers up it displays the wifi signal strength icon, but as soon as I actually go to the network for something (like using the Stocks app for example) the wifi icon disappears and it's replaced by the little circle.
I have tried re-entering the WEP code etc and deleting and reinstating the network on the phone, but none of that solves this problem. I updated to 4.0.1 yesterday hoping it would be the answer, but it isn't.
Any ideas?

Make sure your phone is actually picking up your wifi signal at work and not using the 3G internet.
Try these Apple trouble shooting guides:
Trouble shooting wifi netwroks http://support.apple.com/kb/ts1398
Unable to use wifi http://support.apple.com/kb/ts1559
And if those lead you to an Apple repair tech, you have a hardware problem. If you have the cojones, you can try to repair the hardware yourself like I did http://www.iphonetiquicia.com/repair-iphone-3g-wifi-oven/
I had the cojones to give it a shot and it saved my iPhone. WiFi is now perfectly stable and it no longer runs hot. By the way, that's another indicator, if your iPhone is running hot it could be due to higher resistance in the PCB due to micro-fissures in the solder joints. Once I reflowed my phone it fixed the solder cracks (micro-fissures) and it ran cool like a brand new phone.

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