in general what would you suspect that would mean?
Ive seen this a few times, usually its a red flag that immediately has me click the back button.  But there is this one that I'm considering giving a chance.  After some google research everything looks legit except for this.  I would like to think it just means they are friends that work together but its also odd that I see no ads with them advertising as a double.

May be the pimps phone or LE, I dont think google would know this info.My best guess same chick neither one in the pics.

Could be they are driving together for safety reasons, why not share a phone... reduces costs. Keep in mind this business can be risky, and lonely at times. They are most likely newbies and keeping each other company and looking out for one another. When I first went independent I did the same... We were both apprehensive and not sure what to expect. Now I just let a close friend know where I'm going and what time to expect a phone call to let her know when I'm safely out.

Usually if a provider chages her stage name to dump bad reviews, she changes her phone number also.  
LE has access to plenty of throw-away phones so not likely to be LE.
It could be an agency, a booker, assistant, or a girls co-op.

I think one would have to research all the providers who share that phone...  yes VIP would be required...  and see what the quality of service is.  I'd go from there.

If you are unwilling to invest the time on research, you should move on to a single name provider...  and then do the research.  When it gets to selection time, you really need VIP.  It costs way less than even one spoiled date.
skb

an agency I know out here in Vegas they do this same number and multiple girls all using the same number.I would go with a well-reviewed provider then you do not have to question the phone number thing if the lady in question does not have reviews.Something tells me that if you call more than likely the girl in the pic is not going to be the one at your door.I could be wrong,but it does seem weird to be sharing the same number.Cell phones are so cheap nowadays there is really no reason to share a phone.

i have some experience with advertisements like this.  this is often the case with "behind the scenes agencies" - the girls advertise as independent but all calls go to their "agent" or "scheduler" or whatever he may call himself.  i have known of agencies that do this  (advertise different independent girls with the same number) and didn't do anything classically dishonest - the girls they advertised, you got, and they didn't do upsell tactics.  but they are still agencies i would be apprehensive of.

i interviewed for one to work as a provider there, and the agent was extremely pimplike and tried to pressure me into doing extremely unprofessional things.  and when i see a provider, i want to support a happy, healthy, independent girl, and not an unfair situation like that, so i admit i am put off by those numbers!

my other reason for avoidance is that the agencies like this i've come by have what seem to me to be very sketchy practices, like encouraging their providers to browse client's pants/drawers/wallet for personal info while he is in the bathroom.  they build a very personal database of info about clients, that i certainly wouldn't want stored somewhere random if i were on the client side of the affair!