CAnnot use 3G on my 3GS after upgrading to iOS4.

After updating to iOS4 I can hardly make calls or send texts using 3G after the software update. First I noticed this from my home after years of great coverage here. I spoke with ATT for an hour and we troubleshooted. They tried to call my cell but nothing (we were on a land line). FInally they suggested i switch off 3G and use only EDGE. That works fine but it is EDGE. They researched and called me back three days later but no fix. The suggested I contacted APPLE. Have not done this yet. Ideas???

if you havn't tried yet i would do a restore to factory and set up the phone as brand new.

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