1. Download the free Temp Mail application from the App Store.
2. Run the application and get a temporary mailbox.
3. Copy the mail and register on the right site with this mailbox.
4. After sending the confirmation code, return to the application to check the mail.
So you can quickly get a temporary mailbox without long registration procedures, confirmation by phone number and other.
By the way, this is absolutely free.
PS For iPhone is not suitable, sorry.