Question about SumUp 3G + Printer Payment Kit

only 2G is (was) switched off

Swisscom will switch off its UMTS/3G mobile network by the end of 2025.
Sunrise will switch off its UMTS/3G mobile network by the end of 2026 at the latest.
Salt has not yet published a switch-off date for its UMTS/3G mobile network.
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Sunrise will switch off its 2G/GSM mobile network on 3 January 2023.
Source: https://de.wikipedia.org/wiki...
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Swisscom has removed the last 2G devices from its network and definitely discontinued this technology in mid-April 2021.
Source: https://www.comcom.admin.ch/comcom...

While Vodafone wants to switch off its 3G mobile network in Germany at the end of June 2021, in Switzerland the end for the third mobile generation is not so soon. Industry leader Swisscom wants to stick with 3G until at least the end of 2024.