I’ve noticed on my mobile when it has Glonass activated it gets lock much much faster than with GPS alone* (although this might be down to the half a dozen listed Glonass satellites each showing a stronger signal than any GPS one) - doesn’t seam to be any more accurate in the main when standing still, but when moving about seams to draw much straighter lines (when walking on a straight road that is!). When indoors at home or work (near a window) I tend to see half a dozen Glonass satellites and just a couple of weak GPS ones.

In the city centre it will gain lock within seconds of turning the “GPS” on compared with my Garmin GPS (only) receiver that can take minutes.

*even with GSM, 3G, and WiFi deactivated.