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I've just tested it and it works.
You are a Vodafone customer aren't you? - please answer about contract and PAYG and if the phone was new or second hand.
yes i am a vodafone user,,im not on a contract,,i buy it second hand from ebay and its was restored when it was arrived
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I have the same issue with my iPhone 5. Just taken out a sim only deal with Vodafone, having moved from EE and brought my number with me.
On WIFI I can connect to the internet fine and use my apps online but otherwise on just 3G I get the error when going into my mailbox for example "Could not activate mobile data network" followed by "You are not subscribed to a mobile data service".
I have text "WEB" to 40127 but it just come up with a (!) Not Delivered message next to the text message.
Calls do seem to work fine. Can anybody help resolve this, my unlimited data test drive is somewhat of a none starter!
Just an update. So the morning after I posted the above I checked my phone and it works!
I received two messages overnight telling me I had switched off international calls and adult content, I then turned off my wifi and went online and it just worked.
I guess yesterday the SIM was still becoming active given it was a new contract but I did take the contract out on Sunday lunchtime and it is now Wednesday morning so taken approx. 3 days to port my old number and get all my services.
Hope this update is helpful to anyone having similar issues.