Iphone4 doesn´t work properly in 3G mode

My iphone4 doesn´t work properly in 3G mode. Telefon calls break and telefone quality is poor. Internet is mostly not posssible. With 2G both (Telefone, Internet) work. The problem is not that vodafone net is poor because other smartphones work properly at the same location. Telefone calls often break with "no connection" even with 5 sticks. Internet speed is mostly poor, i.E, slower than 2G. It is definitly not a net problem. I think (not sure) the problems occures wit IOs 4.3.3

Thanks for your help Jeffrey,
But
- I checked with several USB audio devices, from different providers. The issue is the same.
- I checked with several applications (Winamp, MediaPlayer, ...). Same issue.
- I checked these devices with different laptops (tried 3 different models) : I have NO PROBLEM.
- The USB devices I use do not need external power supply. I tried EDIROL UA-25 which works perfectly in any case, but not with my TOSHIBA M40.
- I agree that some application can disturb audio management. But in that case, I would like to know which one from the standard installation is the cause, so that I can fire it. It's anyway curious to see that switching from ACPI to Standard mode fixes the issue, as all applications are still there. I would say the applications are not the issue, then.
- All Microsoft updates have already been installed
- I think I tried everything that could be done by closing applications, changing power management modes, system cache, ...
- I have no other hardware device connected/installed (printer or whatever)
- RECORD works perfectly. So if some application layer was disturbing, I would bet it would bother in Play and Record as well.
CONCLUSION : Unless someone can prove it (and I'm ready for some testing), I still believe there's a harware/driver layer that is faulty in the Toshiba management.
And I don't need to contact the manufacturer, as I AM one of them :)
If you are part of the Toshiba support, let me know. Maybe we can investigate together.
FYI : I had to create a new user ID for this forum as it did not accept the one I created this morning anymore :(
Thanks anyway.

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