iPhone 4S Emitting Radio Sound Waves

Do you mean the phone itself is making a noise, or you have headphones on and you suspect the phone is causing interference? I've gotten headphone interference before when listening to music off my computer and have my phone next to it, but that's because I usually have cheep-o headphones that came with another cell phone to use. When I use my good headphones I have no problems.

 

Might be something to take it into the store for. Although the store environment can be quite noisy, so the person you work with might not hear something and send you walking. Worth a shot though if you have the time to go in for an appointment.

 

Who is your carrier?

 

I was curious if what you were describing might be GSM buzz, but since your carrier is Sprint, it’s definitely not that.

 

Range of human hearing is roughly 20hz - 20khz, sometimes a little higher.

GSM/CDMA is 800-1900M way beyond audible hearing. The noise GSM couples onto speakers is just some of the modulation, or maybe some inrush current spikes emitting some EMI when the transmitters are activating out of sleep.

Nothing in the phone is going to be operating normally that low. Sometimes on random electronics, displays, especially CRTs, but other electronics also can hear noise. I have had to go around and hunt down the offending unit and turn it off, people think I'm crazy. We have a prototype system in our lab now, miniature embedded system with an Atom CPU and custom power supply and I can hear an annoying buzz from it. (Edit: actually it died yesterday, it decided to never power on again for one of my technicians LOL... Yea warranty it!)

Its likely inductor hum from internal power regulators. Take it to a genius bar. Its not at risk of failing anytime soon, I've seen electronics run for years in that state, but it is annoying.

 

Is your 3G on? if so try turning it off and see if it makes a difference.