Check your phone whether has hybrid dual sim slot (show pictures below)
(Dual SIM + Micro SD)  such as:

• -SAMSUNG -> S7/S7 Edge/S8/E5/E7/A3/A5/A7/A8 / C5 Pro / C7 Pro / J2 Ace
• - Redmi --> Redmi Note 3 / Redmi Note 4 /  Redmi Note 4X/  Redmi 3/  Redmi 3s /Redmi 3s prime  /  Redmi 4  /  Redmi 4x  /  Redmi 4A  /  Redmi Pro
• - Xiaomi -->   Xiaomi   4S /5/ 5C /5S PLUS /6/ Mi MAX/ MIX
• - Lenovo-> P2 /Vibe X3/Vibe K5 Note / K6 Power / Phab2 / Vibe-P1  
• - Honor -> 6x/5C /5X   Huawei P8/P9/P9 Lite /p10
• - Motorola -> Moto M 
• - Asus -> Zenfone 3 
• - Oneplus X 
• - Oppo -> F1/ F1 Plus/R9s /R7/R7 Plus /A37 
• - VIVO - V5 / Y53 / Y66 
• - Gionee S6s 
• - Meizu -> M2 Note / M2 Mini / M3S / M3 Note 
• - Coolpad --> Note 5 / Note 3S
• - Etc. sim hybrid slots (combo sim and sdcard).
• NOT Support Elephone p9000,P8000

NOTE IMPORTANT:

• In order to work for Dual SIM mode, your smartphone should support Dual SIM card model. 
• This adapter is only an extender for an extra SIM Card/SD card.