A method and system for setting a charging rate for a terminating call to a prepaid mobile subscriber in a telecommunications network is provided. A query from a GMSC to a mobile subscriber's HLR returns information from a VMSC where the mobile subscriber is registered, including local time information for the MSC where the mobile subscriber is registered. The local time information can be included in an Initial Detection Point at call setup so that a peak or off-peak rate for the call can be set. Additional messaging between the GMSC and the VMSC/VLR can determine the capability of the VMSC/VLR to provide updated local time information for the duration of the call.