Incoming SMS service is available now in your Diamondcard admin center. When you buy a new USA DID the SMS service check box will be displayed. You need to check this box, then add the did to your shopping cart and check out. It can take 24-48 hours for the SMS number to be activated. You will get an email when it's active. The number will also be active for incoming voice calls.
Pricing is set at 2/mth. for unlimited text messages to your Diamondcard inbox and/or email.