Now the system includes host i and two mobile phones a and b, there are 4 rules are as follows:
1. Mobile phones a and b can be connected to i respectively
2. Phone a and b can be disconnected after connecting to i
3. If the mobile phone is not connected to i for more than 60 minutes, it will be damaged and can no longer be connected to the host i
4. If the mobile phone is damaged, it can continue to connect to the host after charging for 30 minutes.
Please design one test cases to cover all 4 rules at least once.