Well to be fair I sometimes do use my keyboard with my phone. Not often, but it can be handy if you get writing something and it turns long. It's mostly for my tablet though.

Could be that, but I don't think there are any other movies out that would be competition for Captain America. A google search suggests they release it elsewhere first to build up hype in the US, and that announcing how much it had made elsewhere does that. This makes no sense to me, but I know very little about marketing! Also something about assessing the reaction so they can make changes if necessary? But this can't be that, no way they could do it that fast.

Maybe they were just waiting for you to be less busy :-)