Method for operating a user equipment in a radio environment comprising a plurality of radio cells (11, 12, 13) of a plurality of mobile communication networks (100, 200, 300), each one of these radio cells (11, 12, 13) being associated, respectively, to at least one mobile communication network of the plurality of mobile communication networks (100, 200, 300), wherein the user equipment measures reception conditions regarding the plurality of radio cells (11, 12, 13), and subsequently selects or registers to a mobile communication network out of the plurality of mobile communication networks (100, 200, 300), wherein the user equipment is associated with a home public land mobile network, HPLMN, and the user equipment comprises a terminal equipment entity or functionality as well as a mobile termination entity or functionality, wherein an AT-command interface is used between, on the one hand, the terminal equipment entity or functionality, and, on the other hand, the mobile termination entity or functionality, wherein, regarding cell selection and/or network selection by the user equipment, an enhanced selection criterion, provided by the HPLMN, is stored in the user equipment, -- wherein, regarding cell selection by the user equipment, a radio cell of a considered radio access technology is considered to be a suitable radio cell only in case that the corresponding reception conditions, as measured by the user equipment, correspond to or exceed the HPLMN-provided enhanced selection criterion regarding the considered radio access technology, and/or -- wherein, regarding network selection by the user equipment, only such mobile communication networks corresponding to suitable radio cells of the considered radio access technology are considered for network selection of the user equipment that have or correspond to reception conditions corresponding to or exceeding the enhanced selection criterion, wherein the method is characterized by comprising the following steps: -- in a first step, the terminal equipment entity or functionality requests a selection parameter information via the AT-command interface, the selection parameter information relating to whether the HPLMN-provided enhanced selection criterion is used by the mobile termination entity or functionality and/or relating to a parameter value of the HPLMN-provided enhanced selection criterion, -- in a second step, the terminal equipment entity or functionality receives the selection parameter information via the AT-command interface. -- wherein, regarding cell selection by the user equipment, a radio cell of a considered radio access technology is considered to be a suitable radio cell only in case that the corresponding reception conditions, as measured by the user equipment, correspond to or exceed the HPLMN-provided enhanced selection criterion regarding the considered radio access technology, and/or -- wherein, regarding network selection by the user equipment, only such mobile communication networks corresponding to suitable radio cells of the considered radio access technology are considered for network selection of the user equipment that have or correspond to reception conditions corresponding to or exceeding the enhanced selection criterion, -- in a first step, the terminal equipment entity or functionality requests a selection parameter information via the AT-command interface, the selection parameter information relating to whether the HPLMN-provided enhanced selection criterion is used by the mobile termination entity or functionality and/or relating to a parameter value of the HPLMN-provided enhanced selection criterion, -- in a second step, the terminal equipment entity or functionality receives the selection parameter information via the AT-command interface.