iPhone 3GS diff sim - same carrier

[mac2thefuture]

Hello,

My mrs has an o2 3GS iPhone.

I put my o2 sim in and I cant surf. The 3G data symbol appears in the top left corner but i get a message saying "you are not subscribed to a cellular data service".

Anything i can do?

 

[tardman91]

Get data service on that SIM card?

 

[mac2thefuture]

Get data service on that SIM card?

The card that I placed in my Mrs iPhone is my works sim which is used in a b/berry and receives emails and surfs etc upon it??