Using a plurality of SIM cards at a wireless communication device

1. A method for using a plurality of subscriber identity module (SIM) cards at a wireless communication system, the method comprising:

a. when a first event trigger occurs:

i. stopping using a first SIM card;

ii. selecting a second SIM card from the plurality of SIM cards;

iii. starting using a second SIM card;

b. when a second event trigger occurs:

iv. stopping using the second SIM card;

v. selecting an operational SIM card from the plurality of SIM cards;

vi. starting using the operational SIM card;

wherein when the first and second event triggers occur more frequent than a threshold, adding a time delay to both first and second event triggers;

wherein the operational SIM card can be the first SIM card, the second SIM card or another SIM card from the plurality of SIM cards;

wherein the criteria for the first event trigger and the second event trigger are different;

wherein the selection of the second SIM is based on tariff price, usage frequency, expected network performance, and priority; and

wherein the selection of the operational SIM card is based on tariff price, usage frequency, expected network performance, and priority.

2. According to the method of claim 1 , wherein the first event trigger is substantially based on at least one of the following: geographical location, data usage, time, duration of usage, and billing cycle information.

3. According to the method of claim 1 , wherein the second event trigger is substantially based on at least one of the following: geographical location, data usage, time, duration of usage, and billing cycle information.

4. According to the method of claim 1 , wherein the first SIM card is used for establishing a first wireless connection, and wherein data packets are transmitted and received using the first wireless connection when the first SIM card is being used.

5. According to the method of claim 1 , wherein the second SIM card is used for establishing a second wireless connection, wherein data packets are transmitted and received using the second wireless connection when the second SIM card is being used; and wherein the operational SIM card is used for establishing a third wireless connection, wherein data packets are transmitted and received using the third wireless connection when the operational SIM card is being used.

6. According to the method of claim 1 , the step of selecting the operational SIM card comprising:

c. determining a list of SIM cards that can be used as the operational SIM card;

d. selecting a SIM card from the list of SIM cards;

when there is a SIM card selected:

e. establishing a wireless connection using the SIM card selected;

f. verifying if the wireless connection can be established; wherein the SIM card selected is the operational SIM card if the wireless connection can be established; and

g. selecting another SIM card if the wireless connection cannot be established;

when there is no SIM card selected, no operational SIM card is selected.

7. According to the method of claim 1 , wherein the first SIM card, the second SIM card or another SIM card are housed at the wireless communication system or are housed at an external device;

wherein the priority of the selection of the second SIM and the priority of the selection of the operational SIM card are based on positions of the second SIM card housed and the operational SIM card housed; and

wherein the wireless communication system is capable of connecting to the external device.

8. A wireless communication apparatus comprising:

a plurality of SIM card interfaces;

a plurality of RF units;

at least one network interface;

at least one processing unit;

at least one memory;

at least one storage unit storing program instructions executable by the at least one processing unit for:

a. stopping to use a first SIM card and start using a second SIM card when a first event trigger occurs;

b. stopping to use the second SIM card and start using an operational SIM card when a second event trigger occurs;

wherein when the first and second event triggers occur more frequent than a threshold, adding a time delay to both first and second event triggers;

wherein the operational SIM card can be the first SIM card, the second SIM card or another SIM card from the plurality of SIM cards;

wherein the criteria for the first event trigger and the second event trigger are different;

wherein the selection of the second SIM is based on tariff price, usage frequency, expected network performance, and priority; and

wherein the selection of the operational SIM card is based on tariff price, usage frequency, expected network performance, and priority.

9. The wireless communication apparatus of claim 8 , wherein the first event trigger is substantially based on at least one of the following: geographical location, data usage, time, duration of usage, and billing cycle information.

10. The wireless communication apparatus of claim 8 , wherein the second event trigger is substantially based on at least one of the following: geographical location, data usage, time, duration of usage, and billing cycle information.

11. The wireless communication apparatus of claim 9 , wherein the first SIM card is used for establishing a first wireless connection, and wherein data packets are transmitted and received using the first wireless connection when the first SIM card is being used.

12. The wireless communication apparatus of claim 8 , wherein the second SIM card is used for establishing a second wireless connection, wherein data packets are transmitted and received using the second wireless connection, when the second SIM card is being used; and wherein the operational SIM card is used for establishing a third wireless connection, wherein data packets are transmitted and received using the third wireless connection when the operational SIM card is being used.

13. The wireless communication apparatus of claim 8 , wherein the step of selecting the operational SIM card comprising:

c. determining a list of SIM cards that can be used as the operational SIM card;

d. selecting a SIM card from the list of SIM cards;

when there is a SIM card selected:

e. establishing a wireless connection using the SIM card selected;

f. verifying if the wireless connection can be established; wherein the SIM card selected is the operational SIM card if the wireless connection can be established; and

g. selecting another SIM card if the wireless connection cannot be established;

when there is no SIM card selected, no operational SIM card is selected.

14. A wireless communication system for using a plurality of subscriber identity module (SIM) cards, comprising:

at least one external device;

at least one network interface;

at least one processing unit;

at least one memory;

at least one storage unit storing program instructions executable by the at least one processing unit for:

a. stopping to use a first SIM card and start using a second SIM card when a first event trigger occurs;

b. stopping to use the second SIM card and start using an operational SIM card when a second event trigger occurs;

wherein when the first and second event triggers occur more frequent than a threshold, adding a time delay to both first and second event triggers;

wherein the criteria for the first event trigger and the second event trigger are different;

wherein the selection of the second SIM is based on tariff price, usage frequency, expected network performance, and priority;

wherein the selection of the operational SIM card is based on tariff price, usage frequency, expected network performance, and priority;

wherein the operational SIM card can be the first SIM card, the second SIM card or another SIM card from the plurality of SIM cards; and

wherein the external device is capable of connecting to the wireless communication system and housing first SIM card, the second SIM card and the another SIM card.

15. The wireless communication system of claim 14 , wherein the first event trigger is substantially based on at least one of the following: geographical location, data usage, time, duration of usage, and billing cycle information.

16. The wireless communication system of claim 14 , wherein the second event trigger is substantially based on at least one of the following: geographical location, data usage, time, duration of usage, and billing cycle information.

17. The wireless communication system of claim 14 , wherein the first SIM card is used for establishing a first wireless connection, and wherein data packets are transmitted and received using the first wireless connection when the first SIM card is being used.

18. The wireless communication system of claim 16 , wherein the step of selecting the operational SIM card comprising:

c. determining a list of SIM cards that can be used as the operational SIM card;

d. selecting a SIM card from the list of SIM cards;

when there is a SIM card selected:

e. establishing a wireless connection using the SIM card selected;

f. verifying if the wireless connection can be established; wherein the SIM card selected is the operational SIM card if the wireless connection can be established; and

g. selecting another SIM card if the wireless connection cannot be established;

when there is no SIM card selected, no operational SIM card is selected;

wherein the first SIM card, the second SIM card or another SIM card are housed at the wireless communication system or are housed at an external device;

wherein the priority of the selection of the second SIM and the priority of the selection of the operational SIM card are based on positions of the second SIM card housed and the operational SIM card housed; and

wherein the wireless communication system is capable of connecting to the external device.