A user equipment, UE, comprising: at least one processor; and at least one memory including computer program code; the at least one memory and the computer program code configured to, with the at least one processor, cause the UE at least to, when the UE operates in a dual registration mode: - determine, when a call request is received from a user, whether the call request is an emergency call request; - if the call request is an emergency call request, determine whether the UE is camping in a cell of a first radio access technology connected to a core network or in a cell of a second radio access technology connected to the core network; - if the UE is camping in a cell of the first radio access technology connected to the core network, determine whether an emergency service is supported (i) in both the first radio access technology connected to the core network and the second radio access technology connected to the core network,, (ii) in only the first radio access technology connected to the core network, (iii) in only the second radio access technology connected to the core network, or (iv) in none of the first radio access technology connected to the core network and the second radio access technology connected to the core network; - if the emergency service is supported in only the second radio access technology connected to the core network and if the UE does not support emergency services fallback, determine whether the UE supports access to the core network via a cell of the second radio access technology; - if the UE supports access to the core network via a cell of the second radio access technology attempt to select a cell of the second radio access technology connected to the core network; and - if the UE finds a suitable cell of the second radio access technology connected to the core network, perform an emergency call by triggering a packet data unit, PDU, session establishment for emergency service via the second radio access technology. at least one processor; and at least one memory including computer program code; the at least one memory and the computer program code configured to, with the at least one processor, cause the UE at least to, when the UE operates in a dual registration mode: - determine, when a call request is received from a user, whether the call request is an emergency call request; - if the call request is an emergency call request, determine whether the UE is camping in a cell of a first radio access technology connected to a core network or in a cell of a second radio access technology connected to the core network; - if the UE is camping in a cell of the first radio access technology connected to the core network, determine whether an emergency service is supported (i) in both the first radio access technology connected to the core network and the second radio access technology connected to the core network,, (ii) in only the first radio access technology connected to the core network, (iii) in only the second radio access technology connected to the core network, or (iv) in none of the first radio access technology connected to the core network and the second radio access technology connected to the core network; - if the emergency service is supported in only the second radio access technology connected to the core network and if the UE does not support emergency services fallback, determine whether the UE supports access to the core network via a cell of the second radio access technology; - if the UE supports access to the core network via a cell of the second radio access technology attempt to select a cell of the second radio access technology connected to the core network; and - if the UE finds a suitable cell of the second radio access technology connected to the core network, perform an emergency call by triggering a packet data unit, PDU, session establishment for emergency service via the second radio access technology. - determine, when a call request is received from a user, whether the call request is an emergency call request; - if the call request is an emergency call request, determine whether the UE is camping in a cell of a first radio access technology connected to a core network or in a cell of a second radio access technology connected to the core network; - if the UE is camping in a cell of the first radio access technology connected to the core network, determine whether an emergency service is supported (i) in both the first radio access technology connected to the core network and the second radio access technology connected to the core network,, (ii) in only the first radio access technology connected to the core network, (iii) in only the second radio access technology connected to the core network, or (iv) in none of the first radio access technology connected to the core network and the second radio access technology connected to the core network; - if the emergency service is supported in only the second radio access technology connected to the core network and if the UE does not support emergency services fallback, determine whether the UE supports access to the core network via a cell of the second radio access technology; - if the UE supports access to the core network via a cell of the second radio access technology attempt to select a cell of the second radio access technology connected to the core network; and - if the UE finds a suitable cell of the second radio access technology connected to the core network, perform an emergency call by triggering a packet data unit, PDU, session establishment for emergency service via the second radio access technology.