Simple Mobile plan and calls to and from Asia and local calls.

We have a visitor from China. Their iPhone 7+ has a sim card and their mother called them today. I received the call on my phone. I can not call back because their phone number is international. My phone can not call international.
He needs to be able to call local (domestic) and to and from China. Best Buy suggested Simple Mobile (powered by T-Mobile) which gave him a sim card. When the card is put into his phone it asked if he wants to keep his own number or get a new number.
In my non technical mind, either choice creates issues. A new number then all his friends and family will be able to call him any time they like if he gives them all his new number. But when he returns to China will he have to re-activate his own phone number?
If he keeps his own phone number the only way we can communicate daily is if he calls me. My Verizon phone can not call him.
Then it was suggested to go back and forth between the two sim cards. One for China to and from USA and the other for USA only.

I have two phones. Easily the fix is for him to use one my phones and I use the other and that is how he makes local calls.
His other phone will be the communication method for him to and from China. He declines, I think out of respect or other, thinking that he might lose or damage my phone. I disagree.

This new Simple Mobile sim card requires the purchase of a Service Pin (Service Plan) using a credit card. We already bought a $25 card that is unlimited call and text to China.
What is the next step as you see it?
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A simple solution will be to purchase 10$ of skype credit are use skype to call china. 10.00$ will be good for 500 minutes, and you can call from any phone that is connected to the internet.

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nickg5Author Commented:
We have decided to let them use their international iPhone for calls to and from Asia.
They will take our spare phone and use it for USA domestic calls.
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