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I have the iPhone 5S on the Sprint network that I purchased in December. While on a call, I am hearing random dial tones as if someone is pressing the key pad. The person that I am speaking with does not hear the sound. It happens very random in terms of frequency and the number of times I hear the dial tone on a call. Also note that I am not accidently pressing the key pad during conversations; this issue happens while using my Apple earbuds as well.
Is there a resolution to this issue? It is quite annoying and disruptive during conversations.
I am having this exact same issue! Iphone 5s, on Sprint, 64 gb. Please, if anyone knows the answer to fix this, please let us know!!