[singular] the system for speaking to someone on the telephone 电话系统 on the phone (=talking using the telephone) 通电话 : Most teenagers spend hours on the phone every day. 大多数青少年每天花在通电话上的时间都有数小时。
by phone/over the phone (=using the telephone) 通电话 : We take orders by phone or by email. 我们接受电话订单或电子邮件订单。
Synonyms and related words