A method for execution in a mobile device, the method comprising: scanning for a network, using a first radio access technology, within at least one of a plurality of frequency blocks of a frequency band; upon finding a network within a particular one of the plurality of frequency blocks, obtaining network identification information for the network; determining whether the network identification information is included in black-list network information of the mobile device prior to making any access attempt on the network; if the network identification is not included in black-list network information of the mobile device, attempting to access the network; and if the network information is included in the black-list network information of the mobile device: determining from the black-list network information at least one radio access technology that is barred for that network identification information, wherein the at least one radio access technology comprises the first radio access technology and any other radio access technology associated with the first radio access technology; aborting the scanning for a network on the first radio access technology and skipping scanning for other networks on any other radio access technology associated with the first radio access technology; and continuing scanning for a network that uses a radio access technology other than the at least one radio access technology that is barred, wherein: the network that uses a radio access technology other than the at least one radio access technology is scanned by skipping the particular one of the plurality of frequency blocks, or scanning the particular one of the plurality of frequency blocks only after searching other possible frequency blocks. scanning for a network, using a first radio access technology, within at least one of a plurality of frequency blocks of a frequency band; upon finding a network within a particular one of the plurality of frequency blocks, obtaining network identification information for the network; determining whether the network identification information is included in black-list network information of the mobile device prior to making any access attempt on the network; if the network identification is not included in black-list network information of the mobile device, attempting to access the network; and if the network information is included in the black-list network information of the mobile device: determining from the black-list network information at least one radio access technology that is barred for that network identification information, wherein the at least one radio access technology comprises the first radio access technology and any other radio access technology associated with the first radio access technology; aborting the scanning for a network on the first radio access technology and skipping scanning for other networks on any other radio access technology associated with the first radio access technology; and continuing scanning for a network that uses a radio access technology other than the at least one radio access technology that is barred, wherein: the network that uses a radio access technology other than the at least one radio access technology is scanned by skipping the particular one of the plurality of frequency blocks, or scanning the particular one of the plurality of frequency blocks only after searching other possible frequency blocks. determining from the black-list network information at least one radio access technology that is barred for that network identification information, wherein the at least one radio access technology comprises the first radio access technology and any other radio access technology associated with the first radio access technology; aborting the scanning for a network on the first radio access technology and skipping scanning for other networks on any other radio access technology associated with the first radio access technology; and continuing scanning for a network that uses a radio access technology other than the at least one radio access technology that is barred, wherein: the network that uses a radio access technology other than the at least one radio access technology is scanned by skipping the particular one of the plurality of frequency blocks, or scanning the particular one of the plurality of frequency blocks only after searching other possible frequency blocks. the network that uses a radio access technology other than the at least one radio access technology is scanned by skipping the particular one of the plurality of frequency blocks, or scanning the particular one of the plurality of frequency blocks only after searching other possible frequency blocks.