When asked "what I want to bring" in the space travel questionnaire, "smartphone" was the second most popular item after "camera". （If you want to know about the questionnaire more, click Plan）
However, even smartphones cannnot be used if communication is out of service area.
Do you know why we can uses smartphones on the planet in the first place?
That's because there are smartphone base stations on Earth.
When we browse the Internet on our smartphones,we send radio waves from our smartphones to the nearest base station.
The base station converts radio waves into light or electrical signals and sends them to the exchange.
The exchange sends a signal to the server of the Internet service provider, so you can use your smartphone.
Click here for details.