The graph below shows the average cost of monthly contract for four different cell phones in a European country from January to September in 2002.
Summarise the information by selecting and reporting the main features, and make comparisons where relevant. Write at least 150 words.
![](https://daxue-oss.koocdn.com/upload/ti/sardine/2654000-2655000/2654367/cf558fd1e43041dd9e77700381b64e91.png)