There is also a new mobile agreement in place with Etisalat (https://en.wikipedia.org/wiki/Etisalat) which appears to be primarily middle east and African. This would be similar to the Axiata, Singtel and like agreements - that is, agreements to allow MBE to talk to subsidiaries about utilizing their infrastructure.
You can see the logo in the scrolling telco images towards the bottom of the 8zmobile page.