MJ will deny connections to telepone numbers that THEY deem abuse of their service. Any frequently called numbers and especially numbers that are for confrence call services that I use for business. I would call-in to a confrence that was hosted by a business and would be cut off in seconds or denied totally from getting in. My land-line and cell phone worked fine, but no MJ Here is a transcript of the on-line support I got. This also includes dialing into confrence calls that do not use MJ's confrencing service. Abby... read full review »