Yes, a SIM adapter can work if your device needs a larger SIM card size than the one you have.
Make sure the SIM card sits completely flat and firmly in the adapter. If the card is crooked, the adapter can get stuck or damage the SIM card reader.
With the Hybrid Traveller you do not need a SIM adapter, as the router uses a nano SIM, the smallest SIM card size.
If you use another router, always check which SIM size that model needs before inserting the card.
With SIM problems
It is best to switch off the router before taking out or inserting the SIM card. Check that the card is the right way round and fully inserted. After changing the SIM, the router should be restarted so that the modem registers on the mobile network again.
Check the SIM card systematically
With problems with a physical SIM card, it helps to separate the card from the router. If possible, test the SIM card in a phone with mobile data and roaming switched on and Wi-Fi switched off. If the internet works there, you know that the SIM card and the service basically work.
Useful links
→ See SIM cards for Sweden and Europe
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