if (!isdigit(*s))
error("!Invalid digit '%c' in destination phone number - at offset %d of option %d from \"%s\": %s",
*s,s-phone,optind,from,args[optind]);
if (!isdigit(*s))
error("!Invalid digit '%c' in destination phone number - at offset %d of option %d from \"%s\": %s",
*s,s-phone,optind,from,args[optind]);