Salaah

Switching off the phone during Salaah

Q: I know if a person's phone rings on loud during salaah, it is permissible to use one hand and switch the ringer off. If the phone rang very loud, and the person expects that it will ring again, someone mentioned that it will be permissible with one hand to take the phone slightly out the pocket, and look at the screen and press a couple things to switch it off (because today's phones can't be switched off without looking). Is this permissible?

Zawaal time

Q:

1) How many minutes before and after the zawaal time is salaah not allowed?

2) If a person is performing salaah and zawaal time comes in, what happens?

3) If a person in the masjid is unknowingly performing salaah through zawaal time what should be done?

Doubting the number of sajdahs performed

Q: I was praying and I got doubts about how many sajdahs I did and I was doing first the Tashahhud and I determined that I would do one more sajdah in case and I was reciting "Assalaamu alayka ayyuhannabeyyu.. " and around here or after "wa" I determined that I was going to do sajdah, but I added "wa Rahmatullaah" and then I stopped and proceeded to do sajdah (I did Sajdah-Sahw afterwards). But now I doubt that I did an "addition" that invalidates the salaah.