Don't keep on asking for recovery email / phone number / verify
Its a bother !!! Of no help really. A person may check one's email on own PC / Laptop / Smartphone / Public Computer. Alerts / Verification takes too much precious time for those on the go. SMS alert. Unexpected sign-in attempt. IP Addresses are different for all those devices, even if one's own.
NO use really as IP/VPN can be mimicked.
Also, phone number input can be used as a tracking device to locate someone ( triangulation ) by government authorities. Smartphone is a tracking device. No need of a chip implant.