The CEO of our company has never been able to view the responsive version of our emails on his S5 before that S4. So we bought one for testing. The emails seem to render fine on the test device but he is still seeing the desktop version on his device. We have had 2 FEs, a QA and myself a UX designer look into this and we haven't been able to solve this issue. Could it be a permissions or settings that doesn't allow media queries?

I really hope someone out there knows what causing this.