You can fuck them every way under the sun while exchanging body fluids; visit their homes or apartments; spend the night, travel together and learn their real names.  However, the one piece of data most protected seems to be their real phone numbers.  I think they are quick to share Google numbers or burner phones...but the real number...not so much.  As I tend to prefer the late 20's age group, perhaps this does not reflect the attitudes of the early 20's demographic.  

Just a thought.

As far as I can tell I've always been given their real phone numbers.  In fact I've often thought that my SBs were way too casual about giving out their real number and maybe should consider a burner app.  But so far I don't think any have used a burner number.

been given a burner phone number, I ghost them.  Its one thing for me to give them my hobby phone number instead of my REAL phone number, but its not okay for them to do it to me.  I know that sounds like a double standard, but I'M the one paying, not them.  Lol    

 
Its really more an issue with hookers than SB's.  When hookers are on their "monthly vacation" for a week, a lot of them don't check their phones until the day before they are due to start working again.  They can give me any number they want as long as its one they check at least every other day.  

 
I recently had a girl give me a number to contact her, and said "when you want to meet up, just text me the day before."  So I did, only I didn't get a response for a week.  When she did respond, it was that she couldn't see me because she had multiple spider bites and was recovering.  Rather they blow her off (she's a great fuck), the next week I texted her for a next day meeting again, and got no response again.  After five days, I texted her that after the spider bites, I will assume she fell asleep on an ant mound and was eaten.  She tried for several days to get me to respond, but it was ghost time.  I moved on seamlessly.  

 
As sweetman says, it has really not been a big issue for me.  I tell them up front (also hookers) that they don't need to "e-maintain" me by texting me "I miss you" once a day.  Its annoying, but if they have something substantive to tell me or ask me, they can text me anytime.  Most keep a reasonable balance and don't waste my time.  

It makes ZERO difference to me. A person can be very responsive using a burner phone or be completely unresponsive with a "real" phone. It's like guns, "guns don't kill people, people kill people" By that same token "Burner phones don't ignore people, people ignore people" lol