The GSMA’s Open Gateway initiative has been pitched as a major new revenue source for mobile operators by liberating and exposing the advanced capabilities of 5G networks to customers and partners. The GSMA issued some eye watering and unbelievable numbers, describing APIs as a $300 billion revenue opportunity for MNOs over the rest of this decade. Although that number may be over wishful, there is no doubting the GSMA’s conviction that network APIs are critical for 5G’s commercial success, or the commitment of some major operators. AT&T is one of those committed operators and has just teamed up with Oracle to offer its 5G network and programmable APIs to help deliver Oracle’s cloud applications to various industry verticals, including telehealth…