I have been using magicJackPlus (MJ+) service for many years using the direct cable connection via my router (and before that magicJack service via my computer). When advising my potential callers about costs to call me (from either land-based telephones or cell phones), I would like to be able to advise them whether any magicJack+ related charges to them are involved. It seems to me that caller charges would depend solely on the terms and conditions of their respective telephone services. However, I wonder whether the nature of the magicJack+ VOIP service permits the overall "system" to detect a sender call to my MJ+ number, and use the Internet, rather than the usual telephone media. If so, then this should render the caller costs at zero. Can someone please clarify this matter, such that I would be able to provide correct advice to my potential callers?