Above are our top recommendations for how to contact First Solar Inc., including their top phone number and live chat options. Below you can compare and contrast the 2 ways to contact First Solar Inc. by looking at which ones are the fastest and which ones other customers recommend the most for solving First Solar Inc. customer service issues as reported to us by the 50 million or so customers that come to GetHuman each year and share their experiences. You can contact First Solar Inc. across the following mediums: Phone, Web.