The Sim Card That You Currently Have Installed. Now head back and tap on bundle menu and select your carrier that you are locked to. This is not a hardware issue with the iphone.
Now head over to sim id and select your sim id, if not sure just select the first one. The sim card that you currently have installed in this iphone is from a carrier that is not supported under the activation policy that is currently assigned by the activation server. The network operator will show up here along with other information like your unique account code or iccid as.