keypad tone heard during phone call

I have the same problem with my iPhone4. I don't hear the beep but the caller on the other end hears it. I am not hitting the keypad as it is not even open.

I have AT&T. Seems to happen when talking to person using a Samsung Galaxy 3 using AT&T network.

If anyone has any solutions, please let us know. Thank you.

I am having the same issues, no matter who I am talking to. It happens using bluetooth or handset.

iPhone 5 64GB, IOS 7.1, Sprint

Same here. iPhone 5. ATT network. Most recent iOS update. It's been happening for months now. I recall reading this thread, or one similar, months ago and at that time there didn't seem to be a solution. I'm bummed to see people, including myself, are still experiencing this with no solution discovered...

+1. Happens to me multiple times on almost every call. AT&T, iPhone 5s, iOS 8.1 (12B411).

Just to keep this issue alive. I have an iPhone 6+ with the latest iOS and also have the random keypad tone occurring during calls. Had this issue since my iPhone 4, iPhone 4S, and now with the iPhone 6+. I think it is an AT&T issue but can't seem to get it resolved.

I have had this happen with iPhone 4, 4s and two Iphone 6. I have AT&T their suggestion is to change my number which I have had for 11 years. I have also lived in 2 separate states and traveled around the US and it constantly happens. It is embarrassing and annoying. I have also had a Microcell installed at my house to see if that would help even though it makes the beeping noise even on the road. i have my sim card upgraded. No answers from AT&T or Apple, but I am glad I am not alone with this issue. My husband has the same phone and has never had this issue!

I'm almost certain it's an indication that the call on the other end may disconnect as they have reached 1 bar cell signal status. This issue has carried over every version of iPhone and all iOS I can remember so, I think it has to be a programmed indication. I have tested it with another person and it seems to match what I suggest, can anyone else confirm my results? It should beep (dial tone) when the other phone reaches 1 bar. It may only be iPhone to iPhone though (thats what I tested). Hope this helps but, I'm pretty sure it can't be fixed as I assume it's a built in feature (not a bug or hardware issue) either on iOS phone app or within most cellular companies (I'm on Rogers).

I Have been hearing the same when I talk to my partner when she is in the car, and the low signal seems to make sense as she is on a carrier with pretty poor coverage, thanks for figuring this one out. So pretty much it's nothing to do with the phone that hears it.

This has happened to my phones for a few years, and it's not an "Apple" thing.

It does it on my Apple and Android phones (I have to have Android for testing). I've been told it's a network issue. I'm in the UK so not on the American networks.

If this is phone-related, seems odd both my phones are doing it. I've replaced/upgraded them over the years, and they still do it. I've not been able to determine a pattern (call length etc).

Seeing that know one has the answer to this issue could it be they do know the answer but won't tell an