The commercial company that manages the directory of common shortcodes, which are rented out for use through the CSCA organization.
Some SMSCs are able to provide a proof of delivery notification (similar to the concept of email COD), once the message has reached the subscriber’s handset. However, this does not mean the message is actually viewed; it has just arrived on the handset. Some SAP Mobile Services customer’s use the notification feature (where available) to trigger their billing process and charge the subscriber for the service.
The requirement set forth by federal legislation that allows consumers of mobile communication services to retain their mobile phone numbers for as long as they wish, even if/when they change mobile service providers. Legislation was passed to stop the requirements by carriers to change phone numbers each time the consumer switched carriers.