I need to write two short paragraphs.

The first should be a description of the uses of a mobilie phone (I use my mobile phone to ......... It has got..... /functions )
The second should contain useful expressions needed when buying a mobile phone? Could you please help me?

First, list for me what uses your phone has.

Then we can work on the second.

Present perfect: http://www.englishpage.com/verbpage/presentperfect.html

Past perfect: http://www.englishpage.com/verbpage/pastperfect.html

See other tenses listed on the left side of those webpages.

Sure! I can help you with that.

First paragraph describing the uses of a mobile phone:
A mobile phone is an indispensable device that serves a multitude of purposes. Personally, I use my mobile phone to stay connected with friends and family through calls and text messages. Additionally, my phone serves as a portable entertainment hub as it allows me to stream videos, listen to music, and play games whenever I want. It also has a built-in camera which enables me to capture precious moments and share them instantly with others. Moreover, my mobile phone is equipped with various social media applications that enable me to stay updated with the latest news and trends. In summary, my mobile phone not only keeps me connected but also provides me with countless entertainment options and a platform to express myself.

Second paragraph containing useful expressions for buying a mobile phone:
When buying a mobile phone, it's important to be prepared and know what to ask. Some useful expressions for this situation include:

- "What are the different models available?" - This question allows you to gather information about the available options.
- "What features does this phone have?" - Asking about the phone's features ensures you understand its capabilities.
- "Is this phone unlocked?" - This question is relevant if you plan on using the phone with a specific carrier or abroad.
- "What is the battery life like?" - Knowing the battery life will give you an idea of how long the phone can last on a single charge.
- "Does it support expandable storage?" - This question is useful if you need additional storage space for your apps, photos, or videos.
- "What is the warranty period for this phone?" - Inquiring about the warranty ensures you're aware of any coverage in case there are any issues with the phone.
- "Are there any exclusive deals or promotions currently available?" - Asking about deals or promotions might help you save some money or receive added benefits.

Remember, when buying a mobile phone, it's essential to ask questions, understand the features and specifications, and compare different options before making a final decision.