我们不能忘记电话的真正用途 英语怎么说

我们不能忘记电话的真正用途
We shouldn't forget the real use/function of phone.
或者说：
The real use/function of phones should not be forgotten.

We can't forget telephon's real purpose.

we can't forget the real function of phones.

We can't forget the true use of telephone.