Originally Posted by sonicking

Are you using a typical laptop or an Android tablet/smartphone?

For my Android smartphone, I was a GrooveIP user connected to my google voice number. So I used this app to make and receive phone calls (on my google voice number) when I was overseas with a Wifi connection. But this app's linkage with a google voice number was decommissioned in late May...

So if anyone has a new suggestion, please let me know~

EDIT: Let me be more detailed about my last trip. I was in South Korea. I enabled the airplane mode on my Android smartphone. [This was to ensure there would no international charges from my phone carrier, Virgin Mobile.] Then in the airport, I rented a WIFI egg. My Android phone was connected to it so all the typical functions worked. Furthermore, because GrooveIP was connected to my google voice number, I was making calls and receiving calls. All the charges simply went through my google voice number. So I was calling back to US free of charge.

My issue with the official Google Hangout and Google Voice apps is that there is no dialer! So I cannot call a typical phone number with them.