No energy is required for regular osmosis as it is a statistical proces involving the random movement of particles: https://www.sainaptic.com/post/what-are-the-differences-between-diffusion-osmosis-and-active-transport
Trees have a vascular system for water transport: https://www.earthdate.org/episodes/how-trees-lift-water
The energy required for a piece of paper to get wet upwards is provided by the reduced surface energy: https://physics.stackexchange.com/questions/2254/when-water-climbs-up-a-piece-of-paper-where-is-the-energy-coming-from
What you would like to have is not paying your ISP for the landline anymore right?
This is easily done by buying a SIP phone (used Yealink T30 start at 15€) and register a virtual number at a SIP provider local to you (e.g. https://sip.us/ starting at 1€/month). Just connect your phone to your regular network, they will give you a set of parameters to configure into your phone and it will behave like a regular landline after that.