To use the Business App you need a working Internet connection. However, in the event that you don't have access to the Internet, there are fortunately possibilities to still be able to work with the Business App.
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Several hardware providers offer devices with the option of using a SIM card running a 3G /4G network. For example, Apple offers this for iPads. You can then contact your Internet provider to arrange a business subscription, so that your device connects to the mobile network at all times.

For more information about this, we advise you to contact Apple or your internet provider.