Cell Phone "Do Not Disturb"

I would love a feature on a cell phone, I’ve never seen it mentioned.

“Don’t make a sound or vibrate until 8:00am Monday”.

“Don’t make a sound or vibrate until the symphony is over at 10:30pm”

Do not disturb me for:
15 min, 30 min, 60 min, 90 min, 120 min

Do not disturb me until [time I specify, and even date & time I specify].

Remind me if I have an alarm set that will go off during that time. Default to allowing the alarm to go through.

Do not disturb = no sounds, no vibration, until the time I specified.

Would also be good to have a count down timer, when time is up, make the alert sound I specify (and have a default sound to use). Egg timer, workshop “share with each other for 3 minutes” timer. Could use multiple count-down timers (for example, “you have 10 minutes to present your ideas, with a 1 minute warning”); 10 should be plenty, don’t you think?

Anyone know of a cell phone with do not disturb and count down timer?

Where would a cell phone designer have to think from to come up with ideas like this?

LG? Samsung? Motorola? Nokia? It’s a little thing, and I’d love you for it…