I recently contacted a BP provider ( I don't think it should matter) who specified 'use discretion during phone call' I asked if she was GFE, and she hung up on me! Is that being indiscreet, I didn't think so. I guess I need some sort of input on this.

Many providers around here would treat you the same way.

Any question regarding specific acts, and what goes on in the room may be regarded as indiscrete. The only way to find out about specific acts is to read reviews. The only question you can ask is "do you have a website" or "can you direct me to a site with your reviews"?

If not, then you are TOFTT if you decide to see her.

Services and price are never to be discussed by phone, email or text. Not only is it considered indiscreet but you don't want to leave a "trail" so the lady will not respond.

As clarence mentioned, ask her if she has reviews or a website.
Asking a provider if she does a specific act or service (GFE in your case) over the phone/email/text is considered indiscreet and bad form.

"What is your rate?" and "when are you available?".  Anything beyond that will usually result in a dial tone.  If you want to see girls who are not reviewed part of the risk you take is that you won't know what services they offer until you see them.

some are more willing to talk but using the abreviations is risky.  In some areas, any abreviation implies sex for money = prostitution.  In some areas, depending on local statute & courts, that might lead to LE bust.  
Newbies should see well reviewed providers, then you look up her ads, her reviews & her web site.  Yes, you do need VIP long enough to make a bucket list...  but the cost is way less than a spoiled date.
If you insist on starting with ANY ad site, you'll have to wade through a lot of BS, scams, & stings to find rthe few gems.  Well reviewed providers may advertize on any site & you can follow the links back there.
HV

Very indiscreet.

Oops, well I guess I blew it (pun intended) with that provider, live and learn. Thanks for the input.