If you're playing the pennies or the OTC you need to get an ETrade account.. many times Scottrade and or TD Ameritrade won't allow you to buy certain stocks...
Yes it’s completely free, I would show you a picture of it but it’s incredibly hard to post pictures while on mobile in IHub. Just look up thinkorswim app on Google and check out the level two pictures there it’s actually a very very well-built app