IPhone Pulse sound when headphones connected

When I connect my Samsung headphones to my iPhones 4s I hear a pulsing type sound and when I play music or get on FaceTime the sounds goes in and out in the rhythm of the pulse. Does anyone know what this may be?

That is odd, however this is pointing to more of a software issue so I would advise trying a firmware repair:
Please note that performing these steps will delete all user data except for your media files (photos, music and video).
If your handset is able to be powered on and unlocked you can follow the below steps to back-up your personal data prior to running the repair.
Backing up your handset
To back up your phone using PC Companion 
1. Go to Support  to install PC Companion on a Windows computer. 
2. When installed, start PC Companion on the computer. 
3. Connect your phone to the computer using a USB cable. 
4. Click Start under Backup & Restore. 
5. Follow the on-screen instructions.
Exactly what contents will be backed up may differ depending on phone model.
You can view detailed information about this as you follow the steps in the Backup & Restore wizard.
Running the software repair
Before you start you have to download the PC Companion software and install it on your PC.
Once installed on your PC, double-click the PC Companion icon on your desktop to start the update.
Please ensure your phone is powered off and not connected to the PC when you begin this process. You are not required to connect the phone until after step 10.
1. Install and open PC Companion then select Support Zone.
2. Phone Software Update.
3. Start.
4. Repair Phone
5. Continue
6. Accept data removal
7. Next
8. Wait for prepare
9. Select Phone
10. Follow the connection steps
 - Official Sony Xperia Support Staff
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