A toll-free phone number for your Shopify store gives you credibility and signals your customers you’re serious.

From the Schneier on Security blog

Isracard used a single cell phone to communicate with credit card clients, and receive documents via WhatsApp. An employee stole the phone. He reformatted the SIM, which was oddly the best possible outcome, given the circumstances. Using the data to steal money would have been much worse.

Here’s a link to an archived version.