METHODS AND SYSTEMS OF ACCESSING CONTACT INFORMATION ON A MOBILE DEVICE

1 . A method of accessing contact information on a mobile device, the method comprising:

caching contact information prior to powering off a mobile device;

storing the cached contact information on the mobile device; and

displaying the cached contact information on a display screen of the mobile device when a subscriber accesses the address book after the mobile device is powered on.

2 . The method of claim 1 , wherein caching contact information comprises caching information from an address book associated with the mobile device.

3 . The method of claim 1 , wherein caching contact information comprises caching one or more of the following:

a name of a contact; and

a contact number associated with the contact.

4 . The method of claim 1 , further comprising:

receiving updated contact information;

replacing at least a portion of the cached contact information with the updated contact information; and

displaying the updated contact information on the display screen.

5 . The method of claim 4 , wherein replacing at least a portion of the contact information comprises:

replacing the cached contact information in a specified order, wherein the order is based on the position of the contact information in the address book.

6 . The method of claim 4 , wherein replacing at least a portion of the contact information comprises:

replacing the contact information in a specified order, wherein the order is based on a predefined priority associated with the contact information.

7 . A method of accessing contact information, the method comprising:

receiving, from a subscriber, an instruction to dial a telephone number, wherein the telephone number is associated with one or more of a session identification number, a contact identification number and a contact name;

if one or more of the session identification number and the contact identification number is expired, transmitting one or more of the session identification number, the contact identification number and the contact name to a server;

receiving from the server one or more of an updated session identification number and an updated contact identification number; and

dialing the telephone number using one or more of the updated session identification number and the updated contact identification number.

8 . A method of accessing contact information, the method comprising:

receiving, from a subscriber, an instruction to dial a telephone number, wherein the telephone number is associated with one or more of a session identification number, a contact identification number and a contact name; and

if one or more of the session identification number and the contact identification number is expired:

placing a call by dialing a direct inward dialing number associated with the contact name, wherein a dial-string associated with the call comprises one or more first dual-tone multi-frequency tones.

9 . The method of claim 8 , wherein dialing a direct inward dialing number comprises:

appending one or more second dual-tone multi-frequency tones associated with the subscriber to the dial-string.

10 . A method of claim 8 , wherein placing a call comprises:

dialing a direct inward dialing number associated with the contact name, wherein the dial-string associated with the call comprises the session identification number and the direct inward dialing number.

11 . A system for accessing contact information on a mobile device comprising:

a mobile device comprising a processor and a processor-readable storage medium for storing cached contact information; and

a server in communication with the mobile device, wherein the server provides updated contact information to the mobile device.