A communication device for handling network configurations, comprising: a storage unit for storing instructions; and a processing means, coupled to the storage unit, wherein the storage unit stores, and the processing means is configured to execute the instructions: receiving a first configuration, configuring a first radio bearer as a master cell group, MCG, bearer, from a first base station, wherein the first configuration is for communicating with the first base station; receiving a second configuration, configuring a second radio bearer as a secondary cell group, SCG, bearer from the first base station, wherein the second configuration comprises at least one of a radio link control, RLC, configuration, a packet data convergence protocol, PDCP, configuration and a semi-persistent scheduling, SPS, configuration for communicating with a second base station; characterising by receiving a radio resource control, RRC, message indicating a reconfiguration of the at least one of the RLC configuration, the PDCP configuration and the SPS configuration; performing the reconfiguration according to the RRC message, when one of following conditions is satisfied: the RRC message changes a SCG of the communication device; or the RRC message reconfigures the second radio bearer from the SCG bearer to the MCG bearer; and stopping performing the reconfiguration, when none of the conditions is satisfied. a storage unit for storing instructions; and a processing means, coupled to the storage unit, wherein the storage unit stores, and the processing means is configured to execute the instructions: receiving a first configuration, configuring a first radio bearer as a master cell group, MCG, bearer, from a first base station, wherein the first configuration is for communicating with the first base station; receiving a second configuration, configuring a second radio bearer as a secondary cell group, SCG, bearer from the first base station, wherein the second configuration comprises at least one of a radio link control, RLC, configuration, a packet data convergence protocol, PDCP, configuration and a semi-persistent scheduling, SPS, configuration for communicating with a second base station; characterising by receiving a radio resource control, RRC, message indicating a reconfiguration of the at least one of the RLC configuration, the PDCP configuration and the SPS configuration; performing the reconfiguration according to the RRC message, when one of following conditions is satisfied: the RRC message changes a SCG of the communication device; or the RRC message reconfigures the second radio bearer from the SCG bearer to the MCG bearer; and stopping performing the reconfiguration, when none of the conditions is satisfied. receiving a first configuration, configuring a first radio bearer as a master cell group, MCG, bearer, from a first base station, wherein the first configuration is for communicating with the first base station; receiving a second configuration, configuring a second radio bearer as a secondary cell group, SCG, bearer from the first base station, wherein the second configuration comprises at least one of a radio link control, RLC, configuration, a packet data convergence protocol, PDCP, configuration and a semi-persistent scheduling, SPS, configuration for communicating with a second base station; characterising by receiving a radio resource control, RRC, message indicating a reconfiguration of the at least one of the RLC configuration, the PDCP configuration and the SPS configuration; performing the reconfiguration according to the RRC message, when one of following conditions is satisfied: the RRC message changes a SCG of the communication device; or the RRC message reconfigures the second radio bearer from the SCG bearer to the MCG bearer; and stopping performing the reconfiguration, when none of the conditions is satisfied. the RRC message changes a SCG of the communication device; or the RRC message reconfigures the second radio bearer from the SCG bearer to the MCG bearer; and stopping performing the reconfiguration, when none of the conditions is satisfied.