Your VOIP calls are going to be easier to compromise than traditional land-line calls, simply because they run over an open network, rather than through the phone company's network. Encryption and tunneling can go a long way toward easing VOIP security concerns. However, encrypted/tunneled VOIP calls are going to be a lot more secure than any cell phone or wireless phone calls, which are relatively easy to intercept and eavesdrop. So if security is a concern, think carefully before making any investment in telephone products. Make sure you pick the one that best meets your needs.