Whom did he expect to answer his phone?

他原来以为谁会接他的电话？

《柯林斯英汉双解大词典》

Instructors answer student questions by e-mail, instant message, phone or fax.

教师用电邮、即时讯息、电话或传真回答学生的问题。

《柯林斯英汉双解大词典》

She paused the video and went to answer the phone.

她停下录像机去接电话。

《牛津词典》

He said he left an answer-phone message saying he had discovered his wife was having an affair and had run over her boyfriend, so he would probably not be available for the rest of the trials because he was "going down for murder".

BBC: Police at Jubilee Park - archive image

With Bluetooth capability, you can use a discreet remote control to change volume, turn the device on and off, toggle between electronic devices, answer hands-free phone calls and stream music, sort of like having a miniature wireless headset in your ear.

WSJ: Conquering Retirement: Hearing-Aid Shopping Tips

You can answer your phone again -- nobody is calling you in the middle of dinner asking for your support.

WHITEHOUSE: President Obama Speaks on the Economy and Middle-Class Tax Cuts | The White House