Ⅰ. telephone “打电话”是及物动词，后接名词、代词或从句。也可作不及物动词，其后用介词to再接宾语。它可缩略为phone.多用于口语中。如：
① Did you telephone Li Lei?
② Telephone (Phone) me tomorrow.
③ He telephoned that he couldn’t attend the meeting.
Ⅱ. ring “打电话”可用作及物动词和不及物动词。如：
① He wanted you to ring him. 他要你打电话给他。
此外：ring for 按铃叫(某人);ring back 回电话;ring off挂断电话。
Ⅲ. ring up “给……打电话”(= call up)如：
①I will ring him up. 我会打电话给他。