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Does iPhone have an SD Card slot? (How to add one)
Amazon.com: ROVE PRO Micro SD Card microSDXC 256GB Memory Card with Full-Size SD Adapter 100MB/s Read Speed, C10, U3, V30, 4K, A2 for Dash Cam, Android Smart Phones, Tablets, Games : Electronics.
How to Move Apps to an SD Card on Android
But nowadays, it is hard to find a device with an SD card slot, especially on premium phones.