The Swiss provider Sunrise will switch off GSM on 3rd Jan 2023.

3G (UMTS) is still available, but the plan is to switch it off in the
next 4-5 years.

Swisscom and Salt plan to switch off 3G further, they switched off 2G
in 2021.

Austrian Magenta Telekom will switch off UMTS on 1st Jan 2024. GSM
will stay available.

A1 announces to switch off 3G at the end of 2024.

German article: https://www.golem.de/news/mobilfunkstandard-schweiz-schaltet-gsm-2023-endgueltig-ab-2208-167418.html

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