Hello,

1. No, it is not possible, you will have to add the phone number to the top bar.

2. Insert this instead of your phone number <a href="tel:+74950052358">+7 (495) 005-2358</a>

You can add a class to the link and hide on the desktop and show only on mobile if you decide to add to the top bar and show only on mobile:

<a class="phone_click" href="tel:+74950052358">+7 (495) 005-2358</a>

And add this code to the Theme Settings > Custom CSS > Desktop:

.phone_click{
display:none;
}

Best Regards