1. A method for performing idle mode operations on a mobile communication device, comprising: determining whether a first subscription and a second subscription share a network operator and are camped on a same base station; receiving network information from the base station using the first subscription when the first subscription is in a voice call and the second subscription is in an idle mode; storing the network information in a shared memory of the mobile communication device in response to determining that the first subscription and the second subscription share a network operator and are camped on the same base station; and performing idle mode operations for the second subscription using the network information stored in the shared memory.