You are not using a dumbphone

In the event of confiscation or theft, contacts, text messages and call lists can be read. In addition, dumbphones are just as susceptible to attacks on the mobile network without further protective measures. Dumbphones cannot be encrypted, you cannot install apps such as password managers on them, you cannot clean your pictures of metadata and you cannot use secure messengers.

So on the one hand, these phones have disadvantages. On the other hand, however, it should also be noted that non-smart devices completely rule out some dangers. For example, the risk of malware infections is much lower here. However, encryption and secure communication seem so important in the face of inflationary confiscation and surveillance that a smart device is definitely preferable.