Certain aspects of the present disclosure propose techniques for Evolution-Data Optimized (EVDO) session handling during inter radio access technology (IRAT) mobility with support for S101 signaling interface. A UE may determine a mobility scenario for transfer of the UE among a first cell and a second cell, while the UE has an EVDO session. The UE may further determine whether pre-registration of a UE EVDO session is allowed via an S101 signaling interface. The UE may perform a procedure related to the EVDO session based on the determined mobility scenario and whether the pre-registration is allowed or not.