@Darren, I'm running into an interesting issue with SMS providers and the choice of underlying carrier that 2600hz assigns. The most predominant landline DID enabling SMS service is Zipwhip and they are rejecting anyone using Bandwidth.com. It's not Zipwhip per say, but Bandwidth that is causing the problem. Whenever Zipwhip converts a landline DID to their service, within weeks Bandwidth reverts the SMS service back to them. Therefore, Zipwhip has given up and refuses to enable anyone on Bandwidth for obvious reasons. In fact, if Bandwidth doesn't change their policy, I'm inclined to ask not to use them going forward. I believe it's small things like this where the option to select the carrier makes sense.