Good experiences with bulk rate SMS providers?

We're a pretty popular service, our users are currently sending 100000+ SMS messages (projected 180k this month, and continuing to grow) per month. We're currently using a primary domestic provider that doesn't provide bulk rates and doesn't provide short code access. We're using a few backup providers as well for max redundancy, but aren't thrilled by 'em.

We're ideally looking for a service that provides good bulk rates/incentives, good uptime/redundancy/reputation, easy API-integration (including respectable error codes!) ;). Right now, we're looking primarily for a domestic US SMS solution, but aren't averse to using the same provider for both International & US.

For those of you using bulk SMS right now - what are your recommendations, experiences, etc. in the bulk SMS domain? It sounds like I'm looking for a golden unicorn here, I know, but any data/recommendations/warnings you've got are helpful!

From serverfault 4a656e

• we have had nothing but GREAT experiences with Twilio.

  From Frank

• I would suggest Clickatell, to meet all your requirements:

  • bulk rates/incentives
  • good uptime and redundancy
  • solid reputation in the industry
  • excellent, well-documented and varied APIs
  • both US and international carriers supported
  • short and long codes available

  For more details see the site: www.clickatell.com

  (Disclaimer: I am currently employed by Clickatell)

  Tom O'Connor : I'm not employed by clickatell, but have used them in the past, and they're very good.
  From Zayne S Halsall

• Check out syniverse or mblox they should be able to handle these things for you.

  From gdurham