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》

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

It would be rude to be speaking to someone face-to-face then answer a phone call, but I can be talking to someone, or even sitting listening to a professor in a class, and also quickly answer a text message at the same time.

FORBES: Young People, Stop Just Texting Me and Give Me a Call Once in a While PLZ! Part Deux