Miguel_Cruz@ub.cc.umich.edu (01/12/89)
Re: moderator's response to my system to find one's ringback number Point well taken. I would never recommend or advocate running something like that after nightfall, and even in the daytime, attempt it on your own conscience. A better solution might be to secure a list of all exchanges in your area code; about 10 valid exchange prefixes are always left out of an area code's numbering plan for plant test functions such as ringback. A trip to the public library's phone book section would give one the information necessary for cross-referencing prefixes. Miguel Cruz