A first mobile device determines a second mobile device losing connectivity to a second network or a communication link between the second mobile device and the second network degrading below a threshold value, the second mobile device assigned a role of sharing broker that brokers sharing of network resources of at least a first network among a plurality of other mobile devices via the second network, the first mobile device and the plurality of other mobile devices participating in a sharing group. Responsive to the determination, the role of sharing broker is activated on the first mobile device.