Short answer: if your phone has no SD card slot, a wireless flash drive (with its own Wi-Fi) or an OTG drive (that plugs into the charging port) is the easiest way to add storage. The right choice depends on whether you want cable-free convenience or maximum speed. Here is a buying guide so you pick the correct one instead of guessing. The three types of add-on phone storage Type How it connects Best for Wireless flash drive Its own Wi-Fi hotspot Multiple devices, no cable OTG flash drive USB-C / Lightning plug Fast direct transfer Wireless SSD Wi-Fi + high capacity Large media libraries What the specs actually mean Connector: match your phone, USB-C for modern Android, Lightning for older iPhones, USB-C for recent iPhones. A dual-connector drive is safest. Capacity: 64-128 GB is plenty for photos and docs; 256 GB+ for lots of video. Speed: USB 3.x is much faster than USB 2.0 for moving big files; look for real read/write numbers, not just "high speed". ...
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