This is a tricky subject. Obviously if you have references then I don't really need real world info. I will request name, phone, and email, but a first name works just fine, and you should have a hobby number and email you use. There are too many applications out there that can give you an alternate number on your already preexisting phone; that's what I use so I don't have a totally seperate phone bill. This information is used to send to your references so they can verify if they've seen you or not and everyone uses something different. I don't save phone numbers, just email addresses to verify if I've seen someone, but I have contacted numerous other girls who couldn't tell me unless I could provide a phone number for them.
Now if you're a newbie, with everything that's going on, yes my screening is more invasive and I will have to know real world info. Not all girls require that, and that's okay, but most girls that are a little more on the high end side want both of you to be safe so you can almost always guarantee whatever screening they do for you they do for everyone to keep safe. I only keep this information until I've seen the person, then I erase everything except his email address so I can once again verify that I have screened him and enjoyed his time.
Basically it comes down to what you're comfortable with and what the girl requires. If she is well established and has been around quite a while I wouldn't worry about it but don't give it to someone who is brand new. If you want to see her, you have to work with what she requires, otherwise there are a lot of other girls who don't require that information but you're more likely to see posts about negative things happening to them. Stay safe and just make mindful decisions and you should be just fine