GSM modems with KPN SIM cards that send data via the 2G network through a dial-up connections will no longer function from 1 April 2021. Examples of such GSM modems are:
- Severa GSM modems
- Siemens TC35T
- GSM versions of Octalarm-T and Octalarm-IP alarm diallers (when controlling pagers)
If data transfer is still required, these modems must be replaced by GSM modems and alarm devices with internet-based data transfer, such as GPRS, 3G or 4G. Because the 2G and 3G networks are also switched off, 4G modems are preferred.