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Originally Posted by Kiwi_in_tok
I simply had to add z to the extra dial-string and remove IP header compression.
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Yeah, some modems need to be reset (ATZ) before sending over any additional info (e.g., data account on-the-fly setting with +CGDCONT), or, even, dialing.
IP header compression helps almost nothing to save bandwidth. V.42bis, on the other hand, is much more important to have because RLE encoders like that can save up to 30-40% bandwidth. Did you try to enable it? It's mostly referred to as 'body compression' in mobile phones and is one of the latest parameters of CGDCONT too.