right sentence to plan a phone interview?

Hello,
I was wondering what is the right sentence to plan a phone interview with somebody. Should i say:
-Can we call us at 8 o'clock?
-Can we call each other at 8 o'clock? (some people say that each other is superfluous)
- Can we call at 8 o'clock?

If none of these sentences are correct could you tell me the appropriate one?
Thank you very much for your help :)

Is it convenient for me/us to call you at 8 o'clock?

And if i want to make it less formal such as to plan a phone call to a friend?

Cheers

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Originally Posted by maxence637

And if i want to make it less formal such as to plan a phone call to a friend?

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OK to call you at 8?

Thanks a lot!