a computer, mobile phone, or a specially designed device from which people can connect to the internet by wi-fi, without having to connect to a public wi-fi point; the use of a mobile phone, etc. in such a way

Many companies rent or sell portable hotspot devices like these for international travel. 许多公司出租或出售这样的便携式热点设备，用于国际旅行。

Portable hotspot functionality would be a good idea for the phone. 便携式热点功能会是手机的一个好功能。