Yes, all iPhones have a proximity sensor just below the ear speaker. When this 
sensor is blocked, the touch-screen is locked during a call to ensure you do 
not accidentally trigger something with your face.

When VoiceOver is on, pulling the iPhone away from your face causes the phone 
to switch to speakerphone. This is so you can easily hear VO whilst interacting 
with the display. For the sighted, there is a speakerphone button on the 
display.

If VO focus is on the call timer during a phone call, the time duration will be 
automatically announced. The solution is to move VO focus away from the call 
timer field. Most iPhones leave the focus wherever it was the last time you 
were on a phone call. Some iPhone 4S owners report VO focus moves back to the 
call timer on every call. I never experienced this with either my iPhone 4 or 
iPhone 5.

David Chittenden, MSc, MRCAA
Email: [email protected]
Mobile: +64 21 2288 288
Sent from my iPhone

On 28/03/2013, at 14:20, "Ray T. Mahorney" <[email protected]> wrote:

> does the 5 do the same thing and if it is near the face is the DTMF pad 
> disabled?
> 
> 
> Ray T. Mahorney
> WA4WGA
> 
> 
> -----Original Message-----
> From: [email protected] [mailto:[email protected]] On Behalf Of 
> DJ
> Sent: Thursday, March 28, 2013 01:06
> To: [email protected]
> Subject: RE: iPhone 4 keeps constantly switching to and from speaker phone
> 
> Guys,
> 
> I've discovered that if while on a call, I can stop VO from announcing
> information such as the elapsed time of the call by taking the phone away
> from my ear and tapping one time toward the bottom of the screen on the End
> button.  After that there is no interruption.  Give that a try.
> 
> DJ
> 
> 
> -----Original Message-----
> From: [email protected] [mailto:[email protected]] On Behalf
> Of Sieghard Weitzel
> Sent: Tuesday, March 19, 2013 9:56 PM
> To: [email protected]
> Subject: RE: iPhone 4 keeps constantly switching to and from speaker phone
> 
> Hi Susan,
> 
> Yes, my 4S also reads out the call duration every 20 seconds or so. It
> doesn't matter if I move focus away from this, eventually the screen locks,
> then if I continue to talk after about 20 or 30 seconds it resumes reading
> the time. I can only hope Apple will implement better handling of this in
> iOS 7, as far as I am concerned Voiceover should not say a thing by itself
> if I am on a call. I know a bunch of people said to just use a 3-finger
> double tap to mute speech altogether, but while this may be a work-around,
> it does not address the issue. In any case, if I am out and about and have
> my iPhone in it's belt case under a jacket or an inside pocket, I basically
> have to stop, tell my dog to wait, then dig out the phone and do all this.
> 
> 
> Regards,
> Sieghard
> 
> 
> 
> -----Original Message-----
> From: [email protected] [mailto:[email protected]] On Behalf
> Of Susan
> Sent: Tuesday, March 19, 2013 4:52 PM
> To: [email protected]
> Subject: Re: iPhone 4 keeps constantly switching to and from speaker phone
> 
> I've had similar issues.  Good luck. I also have an issue with mine calling
> out the elapsed time on the calls.  This is so very annoying.
> Does yours do that?
> 
> On 3/19/13, David Chittenden <[email protected]> wrote:
>> If your case does not cover the display, it is not a case issue for you.
>> 
>> David Chittenden, MSc, MRCAA
>> Email: [email protected]
>> Mobile: +64 21 2288 288
>> Sent from my iPhone
>> 
>> On 20/03/2013, at 7:32, "Christina C." <[email protected]> wrote:
>> 
>>> Where is this sensor located? Thanks for all the advice. I think it 
>>> may
> be
>>> a hardware problem :(. I will try taking the case off first. I do 
>>> have a case on there but it is a minimal case. It's a very simple 
>>> one. I mainly have it on there for the antenna gate issue. :)
>>> 
>>> Christina C.
>>> 
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