This didn't happen when I used basic Messaging, and only recently when I use Message+. Web searches were useless due to frequent updates of system and Verizon's meddling with some apps. I haven't found a setting that controls how numbers are classified by default in Message+ so will probably uninstall and replace with a more reliable SMS feature. Rather than waste any more time on this issue I prefer to keep and fix Message+ if at all possible. Thanks for your help!