The present invention relates to a 2G controlling entity (104) in a common 2G/3G network, wherein the common 2G/3G network comprises a common Core Network, CN, (102) connected to the 2G controlling entity (104) further 5 connected to dual mode mobile stations and to a 3G controlling entity (106) further connected to dual mode mobile stations, the 2G controlling entity (104) comprises means for applying (301) a 3G camping strategy and means for receiving a service request for a service at least supported by the 2G network performed by a dual mode mobile station. The 2G controlling entity 10 (104) comprises means for instructing (303) the dual mode mobile station when connected to the 2G network to perform cell reselection evaluation of 3G network cells (110) only when the 2G network (108) signal strength is below a predetermined threshold. The present invention also relates to a method and to a common 2G/3G network.