I've got a Telecom Microsim that came with the HTC One X I was given when doing the Telecom Tech blogging for that handset earlier on this year. I now want to use it in my iPhone 4, but when I insert it I get no service. When it's in the HTC One X I get 3 out of a possible 5 bars.
Is there something else I need to do to get the SIM working in my iPhone, or should the phone automatically connect to the Telecom network once the SIM is inserted?

