fun fact: most consumer grade GPS stuff can pick up GLONASS, particularly the RF baseband chips found in all modern smartphones, because about 5 years ago Russia threatened to put a 250% import duty on all imported smartphones that didn't function with GLONASS. Therefore companies like Qualcomm which develop the RF chips in a smartphone were required by their customers (such as LG) to include GLONASS.
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Do you know if it's supported in software; say iOS or Android?
On Android, check https://play.google.com/store/apps/details?id=com.chartcross... - it will actually show you which satellites from the constellation are whose: I can see US, Russian and Chinese units. On a higher level, it's integrated into the location provider - the apps don't need to care, they just get a location fix, regardless of the technology used.
As far as I'm aware, all current major android and iOS devices support GLONASS. You can check the phone's specs at gsmarena.com to confirm.