MyBB Community Forums

As greater and greater amount of traffic on websites today is coming from mobile, I was wondering how is mybb for mobile first strategy
I have found xenforo to be a really strong contender for mobile first but it's paid and doesn't have a long track record. I looked around mybb but couldn't find much on mobile friendliness of mybb or any demos. Would appreciate some pointers.
I have seen phpbb3 and couple of other forums on mobile and frankly they suck. They are merely web versions on mobile and make navigation extremely difficult. I hope mybb is different.

default MyBB system is not mobile friendly. responsive themes can be used to make it mobile friendly.
few responsive themes available for free at the themes section & premium responsive / mobile themes also exist (eg.)