A method comprising: receiving, from an intrusion detection system protecting a premises and having at least an armed state of operation and a disarmed state of operation, at least an indication of activation of said armed state of operation of said intrusion detection system; and responsive to said receiving said indication of said activation of said armed state of operation of said intrusion detection system: ascertaining at least a subset of a multiplicity of registered mobile communicators which are located in a vicinity of said premises during an activation time of said armed state of operation, wherein the registered mobile communicators are registered for automatically disarming said intrusion detection system when in vicinity thereof; deactivating said subset of said multiplicity of registered mobile communicators, wherein deactivated registered mobile communicators are no longer operable for automatically disarming said intrusion detection system when in the vicinity thereof; querying, at the end of said activation time, an operator of each deactivated mobile communicator of said deactivated subset of said multiplicity of registered mobile communicators whether to reactivate said deactivated mobile communicator; and responsive to receiving confirmation from said operator of said deactivated mobile communicator, reactivating said deactivated mobile communicator. receiving, from an intrusion detection system protecting a premises and having at least an armed state of operation and a disarmed state of operation, at least an indication of activation of said armed state of operation of said intrusion detection system; and responsive to said receiving said indication of said activation of said armed state of operation of said intrusion detection system: ascertaining at least a subset of a multiplicity of registered mobile communicators which are located in a vicinity of said premises during an activation time of said armed state of operation, wherein the registered mobile communicators are registered for automatically disarming said intrusion detection system when in vicinity thereof; deactivating said subset of said multiplicity of registered mobile communicators, wherein deactivated registered mobile communicators are no longer operable for automatically disarming said intrusion detection system when in the vicinity thereof; querying, at the end of said activation time, an operator of each deactivated mobile communicator of said deactivated subset of said multiplicity of registered mobile communicators whether to reactivate said deactivated mobile communicator; and responsive to receiving confirmation from said operator of said deactivated mobile communicator, reactivating said deactivated mobile communicator. ascertaining at least a subset of a multiplicity of registered mobile communicators which are located in a vicinity of said premises during an activation time of said armed state of operation, wherein the registered mobile communicators are registered for automatically disarming said intrusion detection system when in vicinity thereof; deactivating said subset of said multiplicity of registered mobile communicators, wherein deactivated registered mobile communicators are no longer operable for automatically disarming said intrusion detection system when in the vicinity thereof; querying, at the end of said activation time, an operator of each deactivated mobile communicator of said deactivated subset of said multiplicity of registered mobile communicators whether to reactivate said deactivated mobile communicator; and responsive to receiving confirmation from said operator of said deactivated mobile communicator, reactivating said deactivated mobile communicator. querying, at the end of said activation time, an operator of each deactivated mobile communicator of said deactivated subset of said multiplicity of registered mobile communicators whether to reactivate said deactivated mobile communicator; and responsive to receiving confirmation from said operator of said deactivated mobile communicator, reactivating said deactivated mobile communicator.