Dear folks, First, my environment is I have two iPhones with the same Apple ID signed in, with updated whatsapp version but different phone numbers. All my iOS version is 10.3.1. I am trying to migrate the chat history from my old iPhone 6s to iPhone 7. During restore, the original SIM card is put into iPhone 7 but I put another active SIM card and completed the change number process. The issue happened after I restored my 6s' whatsapp backup to my iPhone 7. After successfully restore from iCloud, when I try to use the iCloud backup feature of whatsapp, it seems halt around 94% (292.6 mb). I tested and isolated this is my network issue. It did not reproducible on my original iPhone 6s.