c*s
2 楼
Then it means that your friend has to either go online or dial a toll-free
number.
Another way to do that is to rely on hardware:
1) Use call waiting modem
2) Use some special call waiting device
You should enable "Call Waiting" feature for your local phone service.
number.
Another way to do that is to rely on hardware:
1) Use call waiting modem
2) Use some special call waiting device
You should enable "Call Waiting" feature for your local phone service.
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