Method and apparatus for data stream registration switching

1. A method on a mobile device for switching a registration for a data transfer, the method comprising:

maintaining a first registration of the mobile device with a first wireless network for a first subscription;

maintaining a second registration of the mobile device with a second wireless network for a second subscription, wherein the first registration is concurrent with the second registration; transferring a user data stream with the second registration; and

switching the user data stream from the second registration to the first registration based on a receipt of a call request so that the user data stream is handled by the first registration concurrently with the call request that is handled by the first registration or the second registration.

2. The method of claim 1 , wherein switching the user data stream comprises automatically switching the data user data stream upon receipt of the call request.

3. The method of claim 1 , wherein the call request corresponds to the first registration, the method further comprising:

transferring the user data stream with the first registration and concurrently handling a call for the call request with the first registration.

4. The method of claim 3 , wherein maintaining the first registration comprises camping on a 3G-compatible wireless network with a first subscriber identity module of the mobile device; and

wherein maintaining the second registration comprises camping on a 2G-compatible wireless network with a second subscriber identity module of the mobile device.

5. The method of claim 1 , wherein the call request corresponds to the second registration, the method further comprising:

transferring the user data stream with the first registration and concurrently handling a call for the call request with the second registration.

6. The method of claim 5 , wherein the second wireless network is a 2G-compatible wireless network.

7. The method of claim 1 , wherein switching the user data stream comprises prompting a user of the mobile device for a registration selection to handle the call request.

8. The method of claim 1 , further comprising switching the user data stream from the first registration back to the second registration upon termination of a call for the call request.

9. A method on a mobile device, the method comprising:

maintaining a first registration of the mobile device with a 3G-compatible wireless network for a first subscription and concurrently maintaining a second registration of the mobile device with a 2G-compatible wireless network for a second subscription;

determining a data registration for a current user data transfer of the mobile device as one of the first registration or the second registration upon receipt of a call request;

selecting a call registration as one of the first registration or the second registration based on the data registration;, and

handling a call for the call request using the call registration so that the user data registration is handled by the first registration concurrently with the call request that is handled by the first registration or the second registration.

10. The method of claim 9 , wherein selecting the call registration comprises automatically selecting the call registration based on the data registration and a preselected user preference upon the determination of the data registration.

11. The method of claim 9 , wherein the mobile device is a dual subscriber identity module dual standby (“DSDS”) device and selecting the call registration comprises prompting a user of the mobile device to switch the current user data transfer to the first registration if the data registration is the second registration.

12. The method of claim 9 , wherein the mobile device is a dual subscriber identity module dual active (“DSDS”) device and selecting the call registration comprises prompting a user of the mobile device to select the first registration as the call registration to allow concurrent handling of the call and the current user data transfer if the data registration is the second registration.

13. A method on a mobile device for switching a registration for a user data stream, the method comprising:

maintaining a 3G registration of the mobile device with a first wireless network for a first subscription;

maintaining a 2G registration of the mobile device with a second wireless network for a second subscription, wherein the first registration is concurrent with the second registration; handling a call with the 3G registration;

receiving a request for a user data stream with the 2G registration;

switching the user data stream from the 2G registration to the 3G registration; and

handling the call and the user data stream concurrently with the 3G registration.

14. A mobile device for a wireless network, the mobile device comprising:

a non-transitory memory; a processor configured to retrieve instructions from the memory; and a first subscriber identity module (“SIM”) and a second SIM; wherein the mobile device is configured to:

maintain a first registration with a first wireless network for the first SIM; maintain a second registration with a second wireless network for the second SIM concurrently with the first registration;

transfer a user data stream with the second registration; and

switch the user data stream from the second registration to the first registration based on a receipt of a call request so that the user data stream is handled b¥ the first registration concurrently with the call request that is handled by the first registration or the second registration.

15. The mobile device of claim 14 , wherein the mobile device is configure to automatically switch the data user data stream upon receipt of the call request.

16. The mobile device of claim 14 , wherein the call request corresponds to the first registration; and

wherein the mobile device is configured to transfer the user data stream with the first registration and concurrently handle a call for the call request with the first registration.

17. The mobile device of claim 16 , wherein the mobile device is configured to camp on a 3G-compatible wireless network with the first SIM; and

wherein the mobile device is configured to camp on a 2G-compatible wireless network with the second SIM.

18. The mobile device of claim 14 , wherein the call request corresponds to the second registration; and

wherein the mobile device is configured to transfer the user data stream with the first registration and concurrently handle a call for the call request with the second registration.

19. The mobile device of claim 14 , wherein the mobile device is configured to prompt a user of the mobile device for a registration selection of either the first registration or the second registration to handle the call request.

20. The mobile device of claim 14 , wherein the mobile device is configured to switch the user data stream from the first registration back to the second registration upon termination of a call for the call request.