Transfers data from a Huawei smartphone to a new iPhone SE smartphone?

Can someone explain "step by step" how to do that?

These are two different systems, once Android and Apple iOS. This will probably only be limited by a roundabout way, especially since the iphones have no removable memory cards and data transfer only takes place via itunes or the iCloud.

At least you can save your contacts on the sim card and take with you.

Thank you. And what "detours" would that be?