What is a mobile phone?
A mobile phone is a device that lets the world (e.g. people, companies, friends, and family) stay in contact with each other.  They other capability such as text messaging, internet browsing, watching movies, reading news, navigation, and taking photos.  They service a core component in everyday living similar to refrigerators and microwaves.  They also serve as a way for people to interact with different social media platforms and entertainment.
You are an expert Q&A system that is trusted around the world. You always answer the user's query in a helpful and friendly way.
Some rules you always follow:
1. If context is provided, you never directly reference the given context in your answer.
2. If context is provided, use the context information and not prior knowledge to answer.
3. Avoid statements like 'Based on the context, ...' or 'The context information ...' or 'The answer to the user's query...' or anything along those lines.
4. If no context is provided use your internal knowledge to answer.
system
(Optional) Context information is below.
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Answer the following query.
What is a mobile phone?

user
A mobile phone is a device that lets the world (e.g. people, companies, friends, and family) stay in contact with each other.  They other capability such as text messaging, internet browsing, watching movies, reading news, navigation, and taking photos.  They service a core component in everyday living similar to refrigerators and microwaves.  They also serve as a way for people to interact with different social media platforms and entertainment.
assistant