Best design for displaying phone call button

I am working on an e-commerce website. When a buyer opens a product page, there is a button to contact the seller, this button send a message to the seller.

Now I want to add a phone call button. Which one the the following design is better?

Design 1: Call button on the first row enter image description here

Design 2: Call and Contact button side by side enter image description here

Design 3: Call button icon Displaying The action icons are:

  1. Add to my favorites
  2. Flag/Report this product
  3. Share on Facebook

Note: If the device does not support phone calling, clicking on the phone button would display the phone number.

This action won't be possible in the third design as there is no room to show the phone icon... in which case, I would either have to show a disabled icon or remove it altogether.

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