Communications systems including multiple computer devices where: (i) for a set of computer devices, used by a common user, it is determined which computer device the user is most actively using; and (ii) an operational mode of a “wireless service” (see definition, below) on one of the other computer devices (that is, a non-most-active computer device) is changed in its operational mode. For example, if a user has two smart phones and the user's first smart phone is determined to be more active than the second smart phone, then on the second smart phone (that is, the non-most-active computer device) a social media home page updating service is turned off. In some embodiments, the change from first operational mode to second operational mode will mean that wireless transceiver hardware (such as an antenna) is turned off for the non-most-active device(s).