You have objected to the marketing of your transaction data
Many network operators sell your movement data to various advertising companies. You can object to this transfer.
More information
Ask the providers how long the data is stored in the various tariffs and with whom it is shared. There are also extra data protection-friendly providers such as "Wetell" in Germany. Nevertheless, these do not protect against the numerous monitoring possibilities in the mobile network! Anonymous SIM cards are therefore always preferable.