他回来之后请给我打电话 英语怎么说??

Please let him phone me back when he comes back.
从句子上理解为：请让他回来了之后给我回电话，回电话的人应该是那个还没回来的人。

please call me as soon as he comes back.

please ask him give me a call until he coming back.

please ask him to call me back when he is back.

please call me when he is back!
不要搞得那么复杂嘛！