Fred,

SKYPE works well for international calls, however, the service can get wonky.  When we working on a project with a company in Finland, we called Verizon, our cell phone provider, and they had a plan that cost us $15 a month.  We did not have to worry about wonkiness issues,  The project lasted three months and it was well worth the $45 to us.  We love peace of mind in tech.  LOL A

Maybe Skype.
Works well for the US, but never tried internationally.

The only time I make an international phone call is if I am traveling out of the U.S. and call home. So...not an issue for me.

I have always used WhatsApp to communicate with international clients and friends.  It works well and it is free!

We have our cell phone service with T-Mobile and for I believe $10 a month have a special low rate for international phone calls. Works great... we do overseas calls frequently as we have family and friends there.

Otherwise, I use Facebook Messenger (free) and Skype (also free)

I have global added to my Sprint/Tmobile plan.  Also whatsApp😎

I make regular calls and am using my regular cell phone carrier with a global plan.  Otherwise, I've been using What's app for voice and video calls, free service and it works well. Also been using Skype as another option. 

Good morning Fred. Not an issue for me, so I have no suggestions. You cell phone carrier may have a solution.

I do not have any services for intl. Lots of great ideas from others.

When I have had to make international calls, have used WhatsApp, it is free also.

Skype or install Whatsapp. 

I would take advantage of the Verizon plan for international calls. 

You can communicate on Facebook at no cost.

No suggestions.

Parked and Reading.

Google voice

I've only used Zoom for international clients.

Would it be wrong for me to freely admit that I don't need to talk to people in other countries who aren't paying 7.40 a minute? LOL I talk to folks all over the world but they're calling me and paying.
Where RE is concerned I have never had occasion to do much business with non-US peeps and 2 we attempted last year were both scammers! China and India! Call me when you're stateside and proof funds in USD! 

WhatsApp & Skype.