A mobile device can select an identifier from a set of identifiers stored by the mobile device. The mobile device can communicate a request for a communication link with a communication system, and the request for the communication link can include the identifier. The communication link can be established based on the identifier. The mobile device can select a second identifier from the set of identifiers. The mobile device can communicate a second request for a second communication link with the communication system, and the second request can include the second identifier. The second communication link can be established based on the second identifier.