Isn't H better than simple 3G? I'm not sure what you mean by trying 3G. Doesn't the phone automatically use the best available connection.
I'm not sure why you mention SMS. Surely GMails are sent via an internet ("mobile data") connection?
I realise that one thing I didn't try was using the WiFi widget to turn WiFi off (there was no relevant WiFi connection available at the time). Would this have made any difference?
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