A toll-free phone number for your Shopify store gives you credibility and signals your customers you’re serious.
From the Krebs on Security blog
You may have heard that today’s phone fraudsters like to use use caller ID spoofing services to make their scam calls seem more believable. But you probably didn’t know that your bank may be making it super easy for thieves to impersonate the bank, by giving away information about recent transactions on your account via automated, phone-based customer support systems.