接电话用的最多的是answer
Will you answer the telephone if it rings?
电话铃声响时请你接电话好吗?
其他表达方式还有：
Hello,May I speak to Miss Li,please?
喂.我可以请李小姐接电话吗?
He is in conference and cannot come to the telephone.
他在开会,没空来接电话.
挂电话：
Ring off
挂断电话
I'd better ring off now.
我该挂电话了.
I have to hang up the receiver now.
我得挂断电话了.
She hung up.
她已经把电话挂了.
不挂电话,在线等候：
Hold on a minute.
请别忙挂断电话.
Hold the line
（不挂断电话）等候