[davismwfl]

Get with the dominate provider(s) in the areas you are evaluating and talk to them, there are tons of options that you won't ever see online from them. Companies like Verizon, AT&T etc have all kinds of business plans which you can't find online, you need to talk with a business account manager. As you'd expect, volume has a large impact on your pricing.

If you are just prototyping and not ready to create a relationship then use one of the online plans with a provider or Twilio etc until you are ready. You'll generally pay a bit more doing this, but for prototyping it gives you more options and you can try different providers etc.