"Free" calls on Betamax aren't really free. Except for one free test call given by some brands at signup, funding your account for €10 or more gives you 120 "freedays", capped at 300 min. per sliding week. Unless you can either use most of that allowance (without going over) or spend your credit on other destinations where they offer good value, it isn't all that good a deal. Depending on payment mode and location, you will be hit with VAT, processing fees, and/or currency conversion charges.