How to determine toll-free phone calls

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How can I know if I get a collect call?

I want to know how to know before I answer the phone.

Is there a mobile application?

142 3 7 years ago

pu1. There is a notice, so you just need to get it if you want. You can't make a collect call secretly

2017-12-12

pu2. When there is a collect call, there is a collect call request first, but there is an announcement about whether to answer the call. Then we can either receive it or reject it

2017-12-12

pu3. Oh... I see... Thank you

2017-12-12

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