This has been asked a couple of times before and I still have the same opinion that having a subcategory for each device is unnecessary. It would create board clutter and would waste time by clicking back and forth between different subcategories. Most of the issues people post aren't always device specific anyway.
I think tags are the best way to sort out specific models and issues. People would find their answers a lot faster if they actually did a search before they posted. How many times have you answered "do I really need a data plan?" or "what's the difference between $29.99 and $44.99?" or "what does the data plan cover?" These questions are asked everyday and often multiple times a day, if people did a simple search BEFORE posting their question, they wouldn't need to make a post at all.
On the flip side, these are what I call freebies because it's an extremely easy question to answer and doesn't take much time to type up a response. Or in some cases, it doesn't take any time at all because I've already created a scripted response for it.
You can lead a horse to water, but you can't make them drink.
