Abstract: A communication device of handling a public land mobile network (PLMN) selection in a roaming network comprises a storage unit for storing instructions and a processing means coupled to the storage unit. The processing means is configured to execute the instructions stored in the storage unit. The instructions comprise determining that the communication device is roaming; selecting a preferred roaming PLMN with a preferred roaming PLMN ID to camp on, if the preferred roaming PLMN ID stored in a subscriber identity module (SIM) of the communication device; and selecting a first roaming PLMN with a first roaming PLMN ID to camp on, if the preferred roaming PLMN ID is not stored in the SIM of the communication device, or the communication device does not find the preferred roaming PLMN and the first roaming PLMN ID is associated with a first home PLMN ID of the communication device.

Abstract: A power saving method for a mobile device in a wireless communication system is disclosed. The power saving method comprises detecting a screen status of the mobile device and switching to different connection states according to the screen status of the mobile device when the mobile device has no data transmission and reception.

Abstract: A method of handling a voice over internet protocol (VoIP) function of a mobile device in a wireless communication system is disclosed. The method comprises arranging a user interface in the mobile device, for a user of the mobile device to control the VoIP function via the user interface; and processing a requested data connection between the mobile device and a network of the wireless communication system according to the VoIP function, when the requested data connection is determined to be a VoIP connection.

Abstract: A method for providing a private information to a mobile user and an associated wireless communication network and mobile station are provided to reduce the consumption of power and radio link bandwidth for transmission of the private information. The method, used in the wireless communication network, comprises paging a mobile station of the mobile user via a paging channel during a paging period to read the private information, and reading the private information by the mobile station via a non-dedicated channel during a reading period after the paging period.

Abstract: A power saving method for a mobile device in a wireless communication system is disclosed. The power saving method comprises obtaining a first parameter according to a first signal transmitted between the mobile device and a first network; estimating a first power consumption of the mobile device in the first network according to the first parameter and a first radio access technology (RAT) employed in the first network; determining whether the first network is suitable according to at least a comparison of the first power consumption with a second power consumption of the mobile device in a second network, wherein the second network employs a second RAT different from the first RAT; and switching to a the second network when the first network is not suitable.

Abstract: A power saving method for a mobile device in a wireless communication system is disclosed. The power saving method comprises detecting a screen status of the mobile device and switching to different connection states according to the screen status of the mobile device when the mobile device has no data transmission and reception.

Abstract: A method of handling a voice over internet protocol (VoIP) function of a mobile device in a wireless communication system is disclosed. The method comprises arranging a user interface in the mobile device, for a user of the mobile device to control the VoIP function via the user interface; and processing a requested data connection between the mobile device and a network of the wireless communication system according to the VoIP function, when the requested data connection is determined to be a VoIP connection.

Abstract: A power saving method for a mobile device in a wireless communication system is disclosed. The power saving method comprises obtaining a first parameter according to a first signal transmitted between the mobile device and a first network; estimating a first power consumption of the mobile device in the first network according to the first parameter and a first radio access technology (RAT) employed in the first network; determining whether the first network is suitable according to at least a comparison of the first power consumption with a second power consumption of the mobile device in a second network, wherein the second network employs a second RAT different from the first RAT; and switching to a the second network when the first network is not suitable.

Abstract: A method for providing a private information to a mobile user and an associated wireless communication network and mobile station are provided to reduce the consumption of power and radio link bandwidth for transmission of the private information. The method, used in the wireless communication network, comprises paging a mobile station of the mobile user via a paging channel during a paging period to read the private information, and reading the private information by the mobile station via a non-dedicated channel during a reading period after the paging period.

Abstract: The present invention provides a cellular phone handset which can display a variety of special characters.