When using the phone on speaker the person on the other end claims they are getting feedback on their end and it was hard to hear. I thought it may be my phone so I took it to T-Mobile to have it checked out. No solution. My wife just upgraded from the S6 to the S7 and she is having the same issue. I never experienced the issue until I was talking with her and the issue is very real and annoying. My daughter has a Iphone and when we talked to her on speaker from either of our phones same issue and we have to come off speaker. What's the issue with this. Carrier or phone?