Reply To: davening in public

I am going to be talking on the phone, and people will see no (audible) words coming out of my mouth, but merely the lips moving? I will be talking on the phone without dialing any numbers?
Or I will say it audibly (and people will realize that I am talking in a language other than English)?
I am not asking for halachic advice, but rather for thoughts and practical advice.

I received the following response from a certain rav to whom I described the above-mentioned situation:

You are portraying an awkward situation. First of all if he is bentching with kavana, they will all see that he is praying, and they will respect him for that. HE can also say the words louder so they will understand that he is doing something religious. After he is finished he can politely explain that he was praying, and thanking G-d for the food that he just ate, which is one of our commandments. Other than that we have to know that there are times that we will have nisyonos, and we will be rewarded for it… and it might also cause them to respect him for it more.