Can't log in to iCloud email
Hi. My iPhone was stolen and I need to access iCloud email to change a password for my mobile phone provider account so I can access it to change my address and get a new sim card. Any suggestions how I can do this as every time I try to go in to iCloud I get a notification that a pass code has been sent to my phone as I don't have an iPad or iMac
iPhone 6, 12