Answer :
Among the three aspects of credibility (Character, Competence, Caring), the most demonstrating here is the character. You were able to observe that the quality of the product is good enough for you to buy it. So you were looking at the characteristics of the product.
There are three aspects of credibility: character, competence, and caring. In this situation, character is what is being described. Due to realizing that you overstated what was actually used by mobile device users while watching tv and making it known there was a mistake, you are showing good character. Making sure you are honest with your work and findings demonstrates credibility in what you say.