Explain, using the data in Table 1, the most likely market structure of the mobile network provider industry in the UK.
Table 1: Market share of mobile network operators in the UK by subscriber numbers, 2022
| Operator | Market Share (%) |
|---|---|
| EE | 34% |
| O2 | 28% |
| Vodafone | 21% |
| Three | 12% |
| Other | 5% |
