The Netherlands: the Dutch authority for the consumers (ACM) will tightly check. Therefore:
- the informaiton must be provided as clear
- the consumer must be able to compare previous and new treatment
- the ocnsumer mustbe informed of his/her right to terminate
- notice period amounts to, at least, one month and,
- -drum roll- the consumer must agree to the change.
Exceptions are:
- the change is in favour of the consumer,
- the change is neutral, or
- if the network provider made clear upfront that changes may take place