Talk:SIM Card sizes/@comment-14.139.85.2-20170131125638/@comment-26150343-20180507035508

Most Chinese smartphones begins introduced 3 slots instead of 2 slots.

3 slots that I mean is 2 slot SIM card and 1 slot micro SD card. This one is very common on most Chinese branded smartphones.

2 slots that I mean is what you said above (1 slot for SIM 1 and the other is SIM 2 or micro SD card). This one is common on most Samsung smartphones and older Chinese smartphones (before I have ever use OPPO R7 Lite which is either single SIM+ micro SD or dual SIM).

A lot of people nowdays uses 2 SIM cards (either 1 SIM card for personal and the other use for buisness OR 1 SIM use in own country and the other use in other country like neighbouring country). The problem is people will carrying 2 phones instead because of no dual SIM function or second SIM slot used by micro SD card.

I recommended you to buy phones with dual SIM slot with micro SD slot instead of single SIM+micro SD/dual SIM.