Do I have to accept the replacement solution when the copper network is removed from my area?

You do not have to accept offers for replacement solutions for telephony and broadband unless otherwise stated in your contract. You can choose telephony and broadband from any company you want that can offer services in the area, but of course, it is important that before you sign a contract, you check that you can use the telephony/broadband in your home. For example, contact the operator you are considering choosing to get current coverage information if you choose mobile home telephony and/or mobile broadband as a replacement. Feel free to ask if the operator has trial offers.