A callable bond is a type of bond where borrowers can pay off their debts at any time, even before the maturity date. In general, Callable bonds provide a higher interest rate (coupon) than Non-Callable bonds. In general, investors are reluctant to buy callable bonds, because there is uncertainty about when issuers can buy back their bonds and this is often done when interest rates fall. So as an investor, of course you will lose, because the profit calculation plan will not match the reality.