Hi there @edgardigital,
Thank you for your post.
For Zettle to work, you need to be connected to a 3G, 4G or wifi network. These connections are much faster than the 2G technology relied on by traditional card terminals. Accepting payments with the Zettle Go app only takes a few kilobytes of data. However, we recommend all Zettle users connect to a stable network with a reliable connection.
More information on this can be found here: Zettle Help
I hope this helps answer your question, have a nice day.
Rebecca
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