It would be a good idea to call before we leave.
我们出发之前打个电话是个好主意。
He was out when I called to see him.
我去拜访时，他不在家。
I'll call back at a more convenient time.
在方便的.时候我会回电话的。
If you have any issues, please call this number.
如有问题，请拨打这个电话号码。
For more information, call this number.
欲知详情，请拨打此电话号码。
What is he doing calling at this time of night?
他干吗这么晚了还打电话？