If you sign up by phone or through the supplier’s website, you do not have to sign a contract. After the activation date, you will receive a letter or an e-mail informing you that the contract is already in force. The letter will be accompanied by the general and particular conditions of your contract. From that moment, the consumer has a period of 14 days to cancel the given instruction and cancel the contract. It is not imperative that you return the contract if it has been signed. 14 days after the date of receipt of the conditions, and if you do not wish to cancel the contract, the delivery will be normal.
If you switch of supplier at a store, you must sign the contract.