Alternatively, you can choose to add second nano SIM card. (techradar.com)
Speaking of which, we're looking at a hybrid dual SIM setup here, you can either use two nano SIM cards, or a nano SIM card and a microSD card (second nano SIM card slot). (androidheadlines.com)
MicroSD card support is available, taking up the second nano - SIM slot in the dual - SIM card tray. (androidheadlines.com)