We recommend that you use Spark.Live’s video / audio or chat interface to interact with the expert for your own safety.

Spark.Live keeps your direct phone number private, and ensures that you maintain privacy.

Alternatively, you can also use email to connect with the expert. 

The chat interface on Spark.Live works exactly like WhatsApp, so it if you hit 'Message' on Expert's profile screen, you will be able to chat in private, and keep the history for months.