I don't think there's any difference in meaning, although "free of charges" is much less common than "free of charge". Regarding your second question about context: given that English normally likes to adopt the shortest phrasing possible, the longer form "free of charge" can be used as a means of drawing attention to the lack of demand for ...
I want to make a official call and ask the other person whether he is free or not at that particular time. I think asking, “Are you free now?” does't sound formal. So, are there any alternatives to...
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Yahoo! Sports: NBA All-Star Weekend 2026: How to watch, full events schedule, where to stream free and more
NBA All-Star Weekend 2026: How to watch, full events schedule, where to stream free and more
syracuse.com: Where to watch the NBA All-Star Games today: NBA free live stream
Where to watch the NBA All-Star Games today: NBA free live stream
For example, imagine some food company decides to make their fruits permanently free. Online, you can "order" them (for free), but in person, what do you do? What would be the professiona...