Say this number

I frequently get calls from people asking me for so-and-so's number, or can I give them the number of a freelance who knows how to do this-or-that. Now that I have finally learnt how to extract a number from my phone without cutting off the caller (I think this is largely to do with phones being better thought out these days) I pull it up on screen and then I go through this little routine:

"So-and-so's number is..."

<looking at screen, holding mouthpiece near mouth>

"Oh seven nine seven six..."

<return phone to ear and wait for response>

"...oh seven nine seven six"

<look at screen again, mouthpiece tilted towards mouth>

"One two three..."

<phone back on ear to find out if they've heard me>

"...one two three"

<back to watching screen again>

"seven eight nine."

<back to ear for the response>

"...seven eight nine"

You can imagine how long this can take if the caller actually does mishear me.

I would like a "Say the number" button where the phone would interrupt the call for a few seconds and clearly dictate the name and number on the screen much in the same way directory services use text-to-speech software to dictate numbers once they have located them. This would also prevent background noise from confusing the dictation when in the pub.