A method and system for securing data of a mobile communications device. The method includes: determining that first application data is data associated with a first server; encrypting the first application data with an encryption key stored in the mobile communications device; storing the encrypted first application data on a memory; receiving a request to access the first application data from an application or a service implemented from the mobile communications device; determining that the application or service is authorized to access the first application data; and in response to said determining, decrypting the first application data with the encryption key.