Welcome to Apple iPhone news and Chat discussion forums. iPhone Discussions is dedicated to iPhone,Talk about iPhone modifications,software,reviews,Support, iPhone news , iphone mobile,iPhone OS and more...
When I am using a headset or earphones while talking on the phone, my voice echoes back at me. When I take out my earphones, the echo is gone and everything is normal. But when i put the earphones back on, the echo continues. I tried turning on the speakers and turning it off some seconds later, but it makes no difference. I recently purchased an iPhone 4, 8gb just the other day.
Did you try a different headset? Are you referring to a cabled or Bluetooth headset?
Whether i use apple earphones or a different brand, such as Sony, nothing is solved. I do not use bluetooth.
Try the basic troublshooting steps as needed, as described in the User Guide, Appendix B:
Restart
Reset
Restore in iTunes using a backup
Restore in iTunes as new (without using a backup)

Reply something about Whenever I am calling using headphones why doesmy voice echoes back at me iPhone or Post a New Thread