iPhone 3GS refusing to use 3G network - ...

new iPhone 3GS factory unlocked (all those in Belgium are like that)
All the settings are like my operator (proximus) wants them.
OS: 3.1.2 (7D11)

All I get is "Could not activate cellular data network" "You are not subscribed to a cellular data service".

Works over wifi, not over 3G.

Finally took my wife's iphone 3G where the internet over 3G works just fine and which has virtually identical settings and swapped SIMs:
result still doe snot work with a SIM that works in a iphone 3G.

I've tried resetting the network settings, rebooting the phoen ad infinitum, nothing helps.

Thinking of returning it to the shop tomorrow. Let somebody else grind his teeth on this useless brick.

edit:
settings proximus wants:
apn: internet.proximus.be
username:
password:
(username and password are blank)

Their support page: http://customer.proximus.be/download/iPhone_mail_en_internet_setup_EN.pdf

Message was edited by: sss666

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