You can have more than one answer. I would pick phpbb at the moment due to its mobile compatability. However, WordPress solutions are probably mobile compatable
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Sure, i agree with you, Phpbb is a good one and have decent default themes for a free forum. Wordpress is best for blogs, not forums. I also find SMF and MyBB equally appealing. But they come with very few customization options in the free version. Also, the advertisements in the free version can be a little intrusive sometimes.You can have more than one answer. I would pick phpbb at the moment due to its mobile compatability. However, WordPress solutions are probably mobile compatable