I’m frustrated

TwitPic sending over TCP causes tweet to fail on Beta 4

I understand from 'help' that TwitPics are always sent over TCP - my question would be, why?
If I establish a WiFi connection to Twitter, can't the TwitPic use Wifi too?
Without this Twitterberry becomes unusable for posting for me as I'm locked into BES unless I establish a WiFi connection :(
I know the TwitPic is trying OTA rather than WiFi as without APN settings it halts at 0% whereas with APN settings it crawls really slowly to 100% (as I'd expect on a UK GPRS connection) then fails.
I'm on beta 4, BB 8900 Curve (Javelin), vodafone UK network.

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