Did you know that Google can search for symbols - including these: ☎, ☏, and ✆? We can use this capability to look for publicly posted phone numbers. Use an area code to find phone numbers in a target location.
Here is an example:
Nether LinkedIn nor Facebook can search by these symbols; Twitter can, though. Searching by ☎, ☏, and ✆ when X-Raying LinkedIn is, therefore, another advantage of LinkedIn X-Ray search vs. its internal search.
P.S. Like this tip? Look, also, into searching by ✉.