Detecting location using WiFi hotspots

1. A method of detecting location comprising:

receiving, on a mobile device, a plurality of previously stored WiFi hotspots;

detecting, on the mobile device, a plurality of surrounding WiFi hotspots;

comparing the plurality of surrounding WiFi hotspots to the plurality of previously stored WiFi hotspots to determine one or more differences between the pluralities, the one or more differences indicating that one of pluralities includes one or more WiFi hotspots not included in the other of the pluralities;

determining that the one or more differences satisfy a difference threshold;

sending at least a portion of the plurality of surrounding WiFi hotspots to a location lookup system; and

receiving a response from the location lookup system.

2. The method of claim 1 , where the response includes a current location of the mobile device.

3. The method of claim 2 , further comprising:

determining the mobile device is within a predetermined distance of a location of interest; and

sending a notification to the mobile device.

4. The method of claim 1 , where the response is an indication that a current location cannot be established by the location lookup system based on the plurality of surrounding WiFi hotspots.

5. The method of claim 4 , further comprising:

obtaining a current location using data acquired from a cellular tower.

6. The method of claim 4 , further comprising:

obtaining a current location using a Global Positioning System (GPS).

7. The method of claim 1 , where the one or more differences include differences between signal level strength between the plurality of surrounding WiFi hotspots and the plurality of previously stored WiFi hotspots.

8. The method of claim 1 , where data in the location lookup system includes associations between WiFi hotspots and respective locations of the WiFi hotspot.

9. The method of claim 1 , where the difference threshold is associated with one or more of the following: a number of additional hotspots, a number of missing hotspots, or signal strengths of hotspots.

10. A method of detecting location comprising:

receiving, on a mobile device, a plurality of previously stored WiFi hotspots;

detecting, on the mobile device, a plurality of surrounding WiFi hotspots;

comparing the plurality of surrounding WiFi hotspots to the plurality of previously stored WiFi hotspots to determine one or more differences between the pluralities, the one or more differences indicating that one of pluralities includes one or more WiFi hotspots not included in the other of the pluralities;

determining that the one or more differences satisfy a difference threshold; and

obtaining a current location using data acquired from a cellular tower.

11. The method of claim 10 , where the one or more differences are that one of the two pluralities includes one or more hotspots that are not included in the other plurality.

12. The method of claim 10 , where the one or more differences include differences between signal level strength between the plurality of surrounding WiFi hotspots and the plurality of previously stored WiFi hotspots.

13. The method of claim 10 , further comprising:

determining the current location of the mobile device is within a predetermined distance of a location of interest; and

sending a notification to the mobile device.

14. The method of claim 10 , where the difference threshold is associated with one or more of the following: a number of additional hotspots, a number of missing hotspots, or signal strengths of hotspots.

15. A computer-readable medium having instructions stored thereon, which, when executed by a processor, cause the processor to perform operations comprising:

receiving, on a mobile device, a plurality of previously stored WiFi hotspots;

detecting, on the mobile device, a plurality of surrounding WiFi hotspots;

comparing the plurality of surrounding WiFi hotspots to determine one or more differences between the plurality of previously stored WiFi hotspots;

determining the differences satisfy a difference threshold;

sending the plurality of surrounding WiFi hotspots to a location lookup system; and

receiving a response from the location lookup system.

16. The non-transitory computer-readable medium of claim 15 , where the response includes a current location of the mobile device.

17. The non-transitory computer-readable medium of claim 16 , further comprising:

determining that the mobile device is within a predetermined distance of a location of interest; and

sending a notification to the mobile device.

18. The non-transitory computer-readable medium of claim 15 , where the response is an indication that a current location cannot be established by the location lookup system based on the at least the portion of the plurality of surrounding WiFi hotspots.

19. The non-transitory computer-readable medium of claim 18 , further comprising:

obtaining a current location using data acquired from a cellular tower.

20. The non-transitory computer-readable medium of claim 18 , further comprising:

obtaining a current location using a Global Positioning System (GPS).

21. The non-transitory computer-readable medium of claim 15 , where the one or more differences include differences between signal level strength between the plurality of surrounding WiFi hotspots and the plurality of previously stored WiFi hotspots.

22. The non-transitory computer-readable medium of claim 15 , where data in the location lookup system includes associations between WiFi hotspots and respective locations of the WiFi hotspot.

23. The non-transitory computer-readable medium of claim 15 , where the difference threshold is associated with one or more of the following: a number of additional hotspots, a number of missing hotspots, or signal strengths of hotspots.

24. A non-transitory computer-readable medium having instructions stored thereon, which, when executed by a processor, cause the processor to perform operations comprising:

receiving, on a mobile device, a plurality of previously stored WiFi hotspots;

detecting, on the mobile device, a plurality of surrounding WiFi hotspots;

comparing the plurality of surrounding WiFi hotspots to the plurality of previously stored WiFi hotspots to determine one or more differences between the pluralities, the one or more differences indicating that one of pluralities includes one or more WiFi hotspots not included in the other of the pluralities;

determining that the differences satisfy a difference threshold; and

obtaining a current location using data acquired from a cellular tower.

25. The non-transitory computer-readable medium of claim 24 , where the one or more differences include differences between signal level strength between the plurality of surrounding WiFi hotspots and the plurality of previously stored WiFi hotspots.

26. The non-transitory computer-readable medium of claim 24 , further comprising:

determining that the current location of the mobile device is within a predetermined distance of a location of interest; and

sending a notification to the mobile device.

27. The non-transitory computer-readable medium of claim 24 , where the difference threshold is associated with one or more of the following: a number of additional hotspots, a number of missing hotspots, or signal strengths of hotspots.

28. A system comprising:

a processor; and

non-transitory computer-readable medium coupled to the processor and having instructions stored thereon, which, when executed by the processor, cause the processor to perform operations comprising:

receiving, on a mobile device, a plurality of previously stored WiFi hotspots;

detecting, on the mobile device, a plurality of surrounding WiFi hotspots;

comparing the plurality of surrounding WiFi hotspots to the plurality of previously stored WiFi hotspots to determine one or more differences between the pluralities, the one or more differences indicating that one of pluralities includes one or more WiFi hotspots not included in the other of the pluralities;

determining that the one or more differences satisfy a difference threshold;

sending at least a portion of the plurality of surrounding WiFi hotspots to a location lookup system; and

receiving a response from the location lookup system.

29. The system of claim 28 , where the response includes a current location of the mobile device.

30. The system of claim 29 , further comprising:

determining the mobile device is within a predetermined distance of a location of interest; and

sending a notification to the mobile device.

31. The system of claim 28 , where the response is an indication that a current location cannot be established by the location lookup system based on the plurality of surrounding WiFi hotspots.

32. The system of claim 31 , further comprising:

obtaining a current location using data acquired from a cellular tower.

33. The system of claim 31 , further comprising:

obtaining a current location using a Global Positioning System (GPS).

34. The system of claim 28 , where the one or more differences are that one of the two pluralities includes one or more hotspots that are not included in the other plurality.

35. The system of claim 28 , where the one or more differences include differences between signal level strength between the plurality of surrounding WiFi hotspots and the plurality of previously stored WiFi hotspots.

36. The system of claim 28 , where data in the location lookup system includes associations between WiFi hotspots and respective locations of the WiFi hotspot.

37. The system of claim 28 , where the difference threshold is associated with one or more of the following: a number of additional hotspots, a number of missing hotspots, or signal strengths of hotspots.

38. A system comprising:

a processor; and

non-transitory computer-readable medium coupled to the processor and having instructions stored thereon, which, when executed by the processor, cause the processor to perform operations comprising:

receiving, on a mobile device, a plurality of previously stored WiFi hotspots;

detecting, on the mobile device, a plurality of surrounding WiFi hotspots;

comparing the plurality of surrounding WiFi hotspots to the plurality of previously stored WiFi hotspots to determine one or more differences between the pluralities, the one or more differences indicating that one of pluralities includes one or more WiFi hotspots not included in the other of the pluralities;

determining that the differences satisfy a difference threshold; and

obtaining a current location using data acquired from a cellular tower.

39. The system of claim 38 , where the one or more differences are that one of the two pluralities includes one or more hotspots that are not included in the other plurality.

40. The system of claim 38 , where the one or more differences include differences between signal level strength between the plurality of surrounding WiFi hotspots and the plurality of previously stored WiFi hotspots.

41. The system of claim 38 , further comprising:

determining that the current location of the mobile device is within a predetermined distance of a location of interest; and

sending a notification to the mobile device.

42. The system of claim 38 , where the difference threshold is associated with one or more of the following: a number of additional hotspots, a number of missing hotspots, or signal strengths of hotspots.