As a stereo headset, these have NO range, but they are better than nothing (try finding anything with the mini usb connector!) -- So go ahead and use these with your razr as a poor man's (woman's) mp3. But if your phone rings, remove the plug and use the phone itself ... the phone interferes with the sound (mic and ear) with the same buzz you get when a cellphone is placed next to a radio or desk phone. For telephone use, this set is worse than useless. But then again, look at the price - all you are paying for is a cheap set of stereo phones ... and that is all you get! Too bad, b/c the button on the mic enables voice dial, etc. If there is a magic trick to shielding these things short of a lead encasement, I would LOVE to know it!