It's possible you need to contact Cingular to allow WAP data transfer. I got in touch with one of their data services guy and he was able to enable this on my account with no additional charges. I was having the same errors: Open tunnel, malformed address, error null, etc. before this. Honestly I'm not completely sure what he did but all my 3rd party apps work fine now and I haven't been charged additional by Cingular. Here's what my bill looks like now:
ExpandedIntlRoamgSvc $0.00
Upgrade $0.00
IMS APN Feature $0.00
Upgrade Processor $0.00
BM 1000 MSG $9.99
BBRYBISUNL $29.99
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