The majority of phone lines into the home continue to be provided by Telefónica, even if you decide to use another provider for your calling charges.
Some regional operators now offer competing services, but it will depend on where you are living. An installation process will typically take 4-5 days, but there are stories of it taking a lot longer - chase the company if they don't deliver.
Telefónica's standard installation package usually includes the free installation and an actual telephone in the price; this not free as it belongs to the company and you will be billed a monthly rental fee. We recommend you skip this and buy your own phone to save cash, but make sure you don't get charged for the rental anyway. Monthly phone line rental is around €20.