Why do some providers change phone numbers so often?  Are they running from their pimps, bad reviews or stalkers.  I usually avoid ladies that change their numbers too frequently.  What do you guys thinks?

Of the 2 providers I see regularly right now, one usually uses an IP phone number, which she could change at will.  The other uses a specific pay-as-you-go phone that she reloads.  For the girls that are using a different phone number every week, I don't see them either.  I assume that they (or their manager / pimp) buys burner phones by the dozen, and never reloads them

almost everytime I dial a wrong number, some gal answers and asks me how soon can I come over.

as they should be.  They have earned it.  Their reputation goes with their "stage name" & to a lesser extend with their phone number which is a good identifier.  
Gals who change their information immediately make me ask WHY?  Sometimes there's a good reason...   but frequent changing numbers is suspicious.

A legitimate provider who changes her number once or twice could be rebranding, or avoiding a stalker, ex SO, or some legal issue, but a provider who changes phone numbers often is not usually a legit provider. Bad reviews, pimps, scammers, bait and switch, and ROBs, all come to mind.