Mobile communication devices may use too much power and/or take too much time when camping on a particular mobile communication network. An apparatus may implement functions that may decrease power usage and/or decrease time usage. The apparatus may be a UE configured to measure energy levels for each frequency channel of a set of frequency channels in a frequency band to determine measured energy levels. The apparatus may also be configured to determining whether a first cell that operates using a first RAT is detected on a frequency channel of the set of frequency channels based on the measured energy levels. Additionally, the apparatus may be configured to search for a second cell that operates using a second RAT, when no cell for the first RAT is detected on the set of frequency channels, wherein the UE searches for the second cell using the measured energy levels.