Twilio , the service that enables developers to add SMS And telephony functionality to their applications with a relatively small amount of work, wants to make sure it keeps growing at a rapid pace. And to do that it's turning to an age-old tactic: it's slashing prices across the board. Twilio is now serving nearly 20,000 developers, and it says that it's using its growing volume to negotiate better deals with the telephony providers it works with (it's also sacrificing some of its margins, but believes it will recoup those and then some as price adjustment drives further growth in its development base). And for many developers the changes are substantial — in some cases, CEO Jeff Lawson says that a developer using Twilio will see as much as 66% in savings.