Why is my Unicom card slow?

Is the mobile phone slow to access the Internet? There are many kinds? ：

1. If a website is slow to surf the Internet, what is the problem with the website? Log in here at this time?

There are many users on the website or the website is upgraded. It is recommended to log on to other websites for testing. ?

2. If the speed of logging in to all websites in a fixed period of time is slow, it may be caused by a large number of people surfing the Internet during this period.

You can try again next time.

3. If you are in a fixed place and log on to all websites all the time, the network speed is slow, which may be related to the network signal?

4. If the internet access speed is slow in all places regardless of time, this situation should be related to mobile phones or cards.

Suggestion? Mobile phone test card change.