From personal experience, Net10 customer service sucks, and you can't bring your own phone.
For the past year or so I've been using a $10 plan from Airvoice Wireless (an AT&T MVNO) for voice & text on an unlocked old BlackBerry (= good signal quality + long battery life). I'm not sure how long Airvoice will last (they seem like a tiny operation) but at least their customer service has been more responsive than Net10's.