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A network connection required to use & athenticate Smart Music Card app.
If the network signal is weak, it may be difficult to install the album and use the app smoothly.
The album installing is required only once very first, and after that, a tiny of data connection is required for a simple authentication for album execute.
It is not enough to worry about data consumption, so you don’t need to worry about it.
After it, Playing albums and see photos do not consume data. The video is played through streaming, so data is required