Parts of a phone

20. Internet phone call

网络电话

21. operator

someone who works on a telephone switchboard, who you can call for help
电话接线员

22. directory assisitance = directory enquiries

a service on the telephone network that you can use to find out someone’s telephone number
电话查号服务

23. automated phone system

24. cordless phone

/ˈkɔːrdləs/
无绳电话，无线电话

25. pay phone

a public telephone that you can use when you put in a coin or a credit card

27. smart phone

智能手机