A voice call method, applied to a terminal comprising a first subscriber module and a second subscriber module, the method comprising monitoring (S11) a network quality of the first subscriber module while performing an Internet protocol Multimedia Subsystem ,IMS, session; and in response to determining that the network quality of the first subscriber module while performing the IMS session does not satisfy a preset network quality condition, and the second subscriber module satisfies a predetermined switching condition, switching (S12) to the second subscriber module to continue the IMS session; wherein the second subscriber module satisfying the predetermined switching condition comprises at least one of: the network quality of the second subscriber module being better than that of the first subscriber module; and, a network traffic accounting mode of the second subscriber module being better than that of the first subscriber module; wherein monitoring (S11) the network quality of the first subscriber module while performing an IMS session is characterized by : comprehensively determining the network quality of the first subscriber module while performing the IMS session based on a plurality of evaluation parameters for the network quality, wherein each of the evaluation parameters for the network quality corresponds to a preset weight. the method comprising monitoring (S11) a network quality of the first subscriber module while performing an Internet protocol Multimedia Subsystem ,IMS, session; and in response to determining that the network quality of the first subscriber module while performing the IMS session does not satisfy a preset network quality condition, and the second subscriber module satisfies a predetermined switching condition, switching (S12) to the second subscriber module to continue the IMS session; wherein the second subscriber module satisfying the predetermined switching condition comprises at least one of: the network quality of the second subscriber module being better than that of the first subscriber module; and, a network traffic accounting mode of the second subscriber module being better than that of the first subscriber module; wherein monitoring (S11) the network quality of the first subscriber module while performing an IMS session is characterized by : comprehensively determining the network quality of the first subscriber module while performing the IMS session based on a plurality of evaluation parameters for the network quality, wherein each of the evaluation parameters for the network quality corresponds to a preset weight. the network quality of the second subscriber module being better than that of the first subscriber module; and, a network traffic accounting mode of the second subscriber module being better than that of the first subscriber module; wherein monitoring (S11) the network quality of the first subscriber module while performing an IMS session is characterized by : comprehensively determining the network quality of the first subscriber module while performing the IMS session based on a plurality of evaluation parameters for the network quality, wherein each of the evaluation parameters for the network quality corresponds to a preset weight. <EOS>