EVO Plus microSDXC Memory Card 64GB Memory & Storage - MB-MC64HA/AM | Samsung US
Amazon.com: Sandisk 64GB Extreme Pro 4K Memory Card works with Samsung Galaxy S9, S9+, S8, S8 Plus, Note 8, S7, S7 Edge - UHS-1 V30 Micro (SDSQXCG-064G-GN6MA) with Everything But Stromboli (TM)
High Speed Samsung Evo 128GB Memory Card with Case [MicroSD Class 10 MicroSDXC] X8Z for Samsung Galaxy S8 active Tab A 10.1 (2016) Sky S9 Plus, S7 S5, S10e S10 Plus On5
Here are the best microSD cards for the Samsung Galaxy S9 & S9+
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Sim Card and MicroSD card tray for use with S9 (Coral Blue)
How to move apps to SD card on Galaxy S9 and Galaxy S9+ - SamMobile
Amazon.com: SanDisk 128GB Ultra Micro SD SDXC UHS-I Class 10 works with Samsung Galaxy S9 Memory Card S9+, S9 Plus (SDSQUAR-128G-GN6MN) with Everything But Stromboli (TM) Card Reader (Class 10 128GB) :
SanDisk Extreme PLUS 256GB microSDXC UHS-I Memory Card SDSQXBD-256G-AN6MA - Best Buy
Amazon.com: Samsung Galaxy S9 Memory Card SanDisk 64GB Ultra Micro SD SDXC UHS-I Class 10 works with S9+, S9 Plus (SDSQUAR-064G-GN6MN) with Everything But Stromboli (TM) Card Reader (64GB) : Electronics
Exclusive: Samsung Galaxy S9 To Support 2TB microSD Cards