This document discusses the rise of two-way SMS messaging (A2P/P2A) and alternatives to using short codes for delivering these services. Short codes have advantages like enabling billing and calls to action, but also drawbacks like limited geographic reach and high costs. Long numbers are presented as an alternative that offers global reach, low costs, standard pricing, and quick integration. Various use cases for long numbers are described, such as marketing, voting, reminders, and customer care. The role of mobile interaction service providers in enabling long number services is also covered.