Downloading data to a mobile device

1. A system comprising one or more computer systems including a combination of hardware and software to:

receive, from a first mobile device, an identifier corresponding to a user account;

store, in a database associated with the identifier corresponding to the user account, an inventory of computer applications and associated program data stored on the first mobile device;

receive an indication from the first mobile device that program data associated with a first one of the computer applications and stored on the first mobile device is to be transmitted to the second mobile device;

receive the identifier corresponding to the user account from the second mobile device;

determine, in accordance with the inventory based on the identifier corresponding to the user account, if the first one of the computer applications is compatible with the second mobile device; and

after receiving the identifier corresponding to the user account from the second mobile device, transmit, to the second mobile device, the program data associated with the first one of the computer applications when the first one of the computer applications is determined to be compatible with the second mobile device.

2. The system of claim 1 wherein the one or more computer systems work in conjunction with a download-assistance tool at the second mobile device to assist with the transmitting of the program data associated with the first one of the computer applications to the second mobile device.

3. The system of claim 1 wherein if the one or more computer systems determine that the program data associated with the first one of the computer applications is not compatible with the second mobile device, the one or more computer systems convert the program data into a format that is compatible with the second mobile device and then transmit only the converted program data to the second mobile device.

4. The system of claim 1 , wherein the one or more computer systems communicate with the first and second mobile devices over a wireless network.

5. A computer program product, tangibly embodied in a non-transitory computer readable medium, the computer program product comprising instructions to be executed by at least one computer system to:

receive, from a first mobile device, an identifier corresponding to a user account;

store, in a database associated with the identifier corresponding to the user account, an inventory of computer applications and associated program data stored on the first mobile device;

receive an indication from the first mobile device that program data associated with a first one of the computer applications and stored on the first mobile device is to be transmitted to the second mobile device;

receive the identifier corresponding to the user account from the second mobile device;

determine, in accordance with the inventory based on the identifier corresponding to the user account, if the first one of the computer applications is compatible with the second mobile device; and

after receiving the identifier corresponding to the user account from the second mobile device, transmit, to the second mobile, the program data associated with the first one of the computer applications when the first one of the computer applications is determined to be compatible with to the second mobile device.

6. The computer program product of claim 5 wherein the at least one computer system works in conjunction with a download-assistance tool at the second mobile device to assist with the transmitting of the program data associated with the first one of the computer applications to the second mobile device.

7. The computer program product of claim 5 wherein if the at least one computer system determines that the program data associated with the first one of the computer applications is not compatible with the second mobile device, the at least one computer system converts the program data into a format that is compatible with the second mobile device and then transmits only the converted program data to the second mobile device.

8. The computer program product of claim 5 , wherein the at least one computer systems communicates with the first and second mobile devices over a wireless network.

9. A method using one or more computer systems including a combination of hardware and software, the method comprising:

receiving, from a first mobile device, an identifier corresponding to a user account;

storing, in a database associated with the identifier corresponding to the user account, an inventory of computer applications and associated program data stored on the first mobile device;

receiving an indication from the first mobile device that program data associated with a first one of the computer applications and stored on the first mobile device is to be transmitted to the second mobile device;

receiving the identifier corresponding to the user account from the second mobile device;

determining, in accordance with the inventory based on the identifier corresponding to the user account, if the first one of the computer applications is compatible with the second mobile device; and

after receiving the identifier corresponding to the user account from the second mobile device, transmitting, to the second mobile, the program data associated with the first one of the computer applications when the first one of the computer applications is determined to be compatible with the second mobile device.

10. The method of claim 9 further comprising working in conjunction with a download-assistance tool at the second mobile device to assist with the transmitting of the program data associated with the first one of the computer applications to the second mobile device.

11. The method of claim 9 further comprising determining whether the program data associated with the first one of the computer applications is compatible with the second mobile device, and if the program data associated with the first one of the computer applications is determined to be is not compatible with the second mobile device, converting the program data into a format that is compatible with the second mobile device and then transmitting only the converted program data to the second mobile device.

12. The method of claim 9 , further comprising communicating with the first and second mobile devices over a wireless network.