What is the bluetooth range(the most distance kept by two phones where bluetooth connection didnt failed) for windows phone ? Is it varry by phone-by-phone ?
As far as I know, most cell phones use Bluetooth power class 2, which has a typical range of 10 m (signal attenuation due to walls and other obstructions notwithstanding).
However, according to T-Mobile, the Lumia 925 has a class 1 Bluetooth radio, which has a typical range of 100 m. It's possible that this applies to other high-end devices as well. Or it could just be a typo.