which slot is sim 1: Popular products. Explained: What Is IMEI Number And What Is Its Utility. Xiaomi Redmi 3S with fingerprint sensor, 4100mAh battery launched ... . Nexus 5 SIM Card Replacement - iFixit Repair Guide.
Both phones also have a microSD expansion
slot which is shared with the second
SIM slot on the tray.
For single-SIM phones, IMEI 1 is the only IMEI, but for dual-SIM phones, it refers to the primary SIM slot.
The Redmi 3S is dual-SIM handset (Micro + Nano) which comes with hybrid SIM slot which means the second slot also acts as a microSD slot.
Insert a SIM card eject tool or a paper clip into the hole next to the SIM
card slot, which is located just under the power button.