Help translate into English sentences.

1, do not buy a mobile phone. Don't buy a mobile phone

You have no subject in this sentence ~ ~ you can't use it in formal occasions and writing.

2. texting will take up too much time.

Sending information is a waste of time.

You are not allowed to use mobile phone in school, because it will disturb others.

Cell phones are not allowed to be used at school because it will interfere with others.

4. I often receive some bad messages.

I often receive some bad information and harmful information.

The cost of mobile phone increases the financial burden of parents.

The cost of mobile phones has increased the financial burden of our parents.