I've been within the mobile and mobile marketing industry since 2009 (http://curtprins.com). I've seen more than my share of companies create apps that no one wanted and miss-use mobile tools at great expense to their budgets and customer loyalty.
(Mobile apps can provide great value, but there's a wealth of other tools to explore first.)
If you're not sure if or where to invest, a quick with me can ease your mind and likely save you a lot of heartaches and $$$.