Providers who say calls only are usually in a rush, book on a short notice, and don't have time for emails/texting back and forth. These are usually the bp providers who are mid to high volume.

For low-volume ladies, it's more proper to email your references, include a little bit about yourself, and book in advance.

who say, "No calls, email only," and many don't even list their phone number for the same reason. Every provider has their own preferences on how to do things. Businesses is probably correct in his analysis. It depends "where" you are looking for your providers.

Do as they ask or try someone else.  

The reasons why they prefer phone contact don't really matter. The other side of the coin is that some girls want NO phone contact at all. They all have their reasons be it security, avoiding the wrong person seeing an email or text or avoiding time wasters who blow up their phone with text messages or their computer with emails.

If you have to pick up the phone to speak with her, chances are good that you won't waste your precious time with some girl you are sending a copy/paste email form letter to, which is a waste of her to respond to.

Also, many emails are really rude and brief, such as:  "Do u do u anal?"

Plus, email and text...well, you never know who is on the other side.

I agree with you Dude

I prefer to make initial contact through email as well.
Business had a point in that it seems the higher volume providers do not have the time or patience for emails. Those aren't the type of providers I would normally seek out.