[iPhone Compromised - is it possible?]

1 hour ago, alvarnell said:

Sounds like a SIM card swap was done at some point by someone who had access to your debit card information. See https://www.wired.com/story/sim-swap-attack-defend-phone/.

Hey alvarnell, thank you for the reply.

How would they get my debit card info though? 

[iPhone Compromised - is it possible?]

So, I have just found out my iphone was used at 7pm last night to make a purchase from the online Adidas store here in the UK.

Now this could not be as it was sitting next to me on my desk as i used my macbook to make music at that time. 
How do i know it was the iphone that made the purchase?
After I noticed a £53 transaction on my bank account today from yesterday which i never placed, I called my banks fraud team who proceeded to tell me my iphone device was used to make the order online, using my debit card *(which was not attached to apple pay on my iphone, it is not stored anywhere as it has been a new card i got at the beginning of the month)

The only thing that links or relates to this transaction last night is two prior online payment confirmations from two seperate credit card apps.

eg. Log into App, click make payment, select amount then the app sends me to Safari browser on iphone to enter my 3 digit CVV code to make the payment outside of the app.

I did this twice (two seperate credit card apps) and the fraud team confirmed these two transactions were the ones that show it was my iphone which made this fraudulent transaction last night as the same device ID was used.... impossible!!!!   

How can this be when it was sitting next to me? 
is my iphone compromised?
Has it been cloned?
How did they get both my new card details AND my iphone device id?