Methods for tracking usage of a network by a plurality of users of a mobile phone include associating a plurality of user accounts with the mobile phone, where ones of the plurality of user accounts correspond to ones of the plurality of users of the mobile phone. Usage of the network by the mobile phone is automatically attributed to one of the plurality of user accounts responsive to receiving identifying information for a corresponding one of the plurality of users of the mobile phone. Charges for the one of the plurality of user accounts are calculated based on the usage attributed to the one of the plurality of user accounts. Related devices and computer program products are also discussed.