[kuschku]

My phone – which combines GPS with GLONASS – usually gets about 40m accuracy with just GPS, but with combined GPS and GLONASS I have about 24 satellites in view, even in buildings, getting better than 1m precision.

[jfaat]

In fact, the vast majority of modern smartphones support GLONASS.

http://en.wikipedia.org/wiki/List_of_smartphones_supporting_...

[kuschku]

It makes sense, north of 50°N GPS accuracy goes quickly down, as most of its satellites’ orbits are optimized for coverage over the equator.