lovelorn

Will someone who has Voip please let me know how you get it and how to use it. We are with belgacom but the bill comes to 350€ per bill - just a small family with one teen.
We have wifi ( via b-box 2) if that helps. Would we need to buy new pnones - and where are they to be got please ( if not in usual place like kreffel and carrefour) Thank you in advance.