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Windows Central Question i reset my phone to the factory after it has problem with downloading app from store and for telegram or whatsapp it said you should install app in internal hard drive
your phone has two kinds of storage - internal and external.
Internal is that storage that comes with the phone by default - it can be 4Gb, 8GB, 16, 32GB, 64GB
External storage is storage that you add yourself via a microsd slot for microsd cards - you can add any size as long as it the card is recognised by the phone and it can read that capacity
Certain apps can only work from internal storage
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