You have to carry a pager so that they can call you in at any time.
你得带个传呼机，以便他们随时可以联系到你。
《柯林斯英汉双解大词典》
2
"People are also more likely to lie in real-time—in an instant message or phone call—than if they have time to think of a response," says Hancock.
汉考克说：“与有时间考虑如何回应相比，人们在发即时信息和打电话时更有可能撒谎。”
3
Whenever she called her parents or other relatives, she always had to think about the time difference so that she wouldn't wake someone up or call when she knew they were in church.