Same pair of SIMS in the Moto and then the Oppo in my anecdotal report.
It could be anything, but on balance of probabilities the differences in the phones cannot be summarily dismissed, obviously allowing for the experience @ItAintMe posted to be complex per capacity, etc etc, and the disparities @phb called out between full and wholesale network services; yet the phones matter and few probably focus on them as part of their service equation.
