"exploratory call" is a correct and usable phrase in written English.
You can use it to refer to a call or conversation made to explore a topic or situation in more detail. For example: We had an exploratory call with the potential client, during which we discussed their needs and our ability to meet them.
He made exploratory calls to a few U.N. and city officials.
Any Democratic challengers have a narrow window to show themselves by making exploratory calls, collecting signatures, turning up to public events, and generally testing whether the congressman is vulnerable.
I expect Yahoo will briefly consider its alternatives and probably make a couple of exploratory calls to other potential bidders, including Google and AT&T.
But there was no video link and no exploratory phone call.
The Houston Astros obtained Beltran as a result of an exploratory telephone call Hunsicker made to his Royals counterpart, Allard Baird, last weekend.
It begins with the exploratory phone call Erdely made last July to Emily Renda, a U.V.A. expert on sexual assault, looking for a campus rape case to write about.
His successor, Chuck Kopp, recalled that in an exploratory phone call and then a job interview, Ms. Palin's aides mentioned the governor's concerns about Trooper Wooten.
The toughest part about finding the apartments was occasionally having to endure the ritual of the scoffing broker, who delighted in spending the first few minutes of an exploratory phone call insisting that there were no one-bedrooms out there in the $1,000 range.
Hence, the concentrated opening areas of these projects are invariably investigated during the design stage by a series of small exploratory tunnels called drifts, which also provide for in-place field tests to investigate engineering properties of the rock mass and can often be located so their later enlargement affords access for construction.
