A system for managing mobile electronic communications devices comprising: a user directory database configured to hold authentication data associated with at least one user; an authentication authority communicatively connected to the user directory database, the authentication authority configured to: accept or deny authentication data for a user received from at least one mobile electronic communications device; to store status information corresponding to authenticated users in the user directory database; and to store an association between each authenticated user and each mobile electronic device that sent authentication data for an authenticated user in the user directory database; an administration server configured to send and receive command messages with at least one mobile electronic communications device; to identify that a second mobile electronic communications device sending valid authentication data for a user is different from a first mobile electronic communications device associated with the user in the user directory database; to send user configuration data and open messages to the second mobile electronic communications device; and to send a command message to the first mobile electronic communications device in response to the second mobile electronic communications device sending valid authentication data, the first mobile electronic communications device being configured to erase at least a portion of data stored in a memory in the first mobile electronic communications device in response to receiving the command message; a messaging server configured to send and receive communications messages with at least one mobile electronic communications device; and the authentication authority, administration server, and messaging server being configured to send and receive data via a data communications network. a user directory database configured to hold authentication data associated with at least one user; an authentication authority communicatively connected to the user directory database, the authentication authority configured to: accept or deny authentication data for a user received from at least one mobile electronic communications device; to store status information corresponding to authenticated users in the user directory database; and to store an association between each authenticated user and each mobile electronic device that sent authentication data for an authenticated user in the user directory database; an administration server configured to send and receive command messages with at least one mobile electronic communications device; to identify that a second mobile electronic communications device sending valid authentication data for a user is different from a first mobile electronic communications device associated with the user in the user directory database; to send user configuration data and open messages to the second mobile electronic communications device; and to send a command message to the first mobile electronic communications device in response to the second mobile electronic communications device sending valid authentication data, the first mobile electronic communications device being configured to erase at least a portion of data stored in a memory in the first mobile electronic communications device in response to receiving the command message; a messaging server configured to send and receive communications messages with at least one mobile electronic communications device; and the authentication authority, administration server, and messaging server being configured to send and receive data via a data communications network. accept or deny authentication data for a user received from at least one mobile electronic communications device; to store status information corresponding to authenticated users in the user directory database; and to store an association between each authenticated user and each mobile electronic device that sent authentication data for an authenticated user in the user directory database; an administration server configured to send and receive command messages with at least one mobile electronic communications device; to identify that a second mobile electronic communications device sending valid authentication data for a user is different from a first mobile electronic communications device associated with the user in the user directory database; to send user configuration data and open messages to the second mobile electronic communications device; and to send a command message to the first mobile electronic communications device in response to the second mobile electronic communications device sending valid authentication data, the first mobile electronic communications device being configured to erase at least a portion of data stored in a memory in the first mobile electronic communications device in response to receiving the command message; a messaging server configured to send and receive communications messages with at least one mobile electronic communications device; and the authentication authority, administration server, and messaging server being configured to send and receive data via a data communications network.