1. A method for performing idle mode operations on a mobile communication device when a first subscription is in data communication with a base station and a second subscription is in an idle mode, comprising: determining, by a processor of the mobile communication device, whether the first subscription and the second subscription share a network operator and are camped on a same base station; receiving, by the processor through a radio frequency (RF resource) of the mobile communication device, network information from the base station using the first subscription; storing, by the processor, 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, by the processor, in the shared memory.