How to say in Czech: We do not know his mobile number.

English
do not know
Czech
My neznáme jeho mobilní číslo.
What is his telephone number?
Do we know his mobile number?
We know his mobile number.
We do not have his mobile number.
We do not need his mobile number.
Did we forget his mobile number?
Do we have his mobile number?
Do we need his mobile number?
Do we want his mobile number?
We forgot his mobile number.

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