The number you are enquiring about is a ‘non-standard’ 07 number and hence is charged at 40p/min. Here is a link to these types of numbers and which ones you will be charged for:-
In your case, it is labelled as a ‘FM10 Mobile’. I can’t explain what is meant by this code in the ‘BT Wholesale Category’ column as they’re not explained anywhere on the iD Mobile website. Definitely an oversight by iD and would be a great help to explain them.
Glad I could help @Peter Aldridge 👍🏻 I didn’t know Octopus had that contact number🤔 (as I am also with them). The only one that I know of is 0808 164 1088 for their Customer Service. And calling 0808 numbers from an iD Mobile phone is free, just like calls to 0800 numbers.
Where did you get the ‘07893 950***’ number from? I don’t think they would have a ‘non-standard’ contact number so please be careful as this appears to be a scam contact number.