Do the Transfer Before You Lose the Old Access
The golden rule of moving your cat's digital life is to make every change while you can still sign in the old way. Once an old phone is wiped or an old email inbox is closed, password resets and verification links go to a place you can no longer reach, and a simple update turns into a support request. So start while both the old device and the old inbox are still in your hands, even if the new phone is already set up and tempting to switch to straight away.
Make a quick list of everywhere her information lives: the vet clinic portal, the microchip registry, any pet app profiles, insurance accounts, and cloud folders holding scans of her documents. Working from a list stops the classic outcome where three accounts move smoothly and the fourth, usually the chip registry, is discovered months later still pointing at a dead email address.
Update Contact Details Inside Each Account First
In each account, change the email address and phone number in the settings themselves rather than creating a fresh account, because a new account usually starts empty and orphans the history attached to the old one. After each change, watch the new inbox for a confirmation message and click it promptly, since many services keep the old address active until the new one is verified.
Then export what you can. Download or screenshot her vaccination history, weight records, microchip number, and insurance details, and save them with her scanned documents. Exports are your safety net if an account merges badly or a profile displays incorrectly after the move, giving you a dated copy of what the record said before you touched anything.
Sign In on the New Phone and Check Like a Stranger
Once the details are updated, sign in on the new phone and check her records as if you had never seen them: is the profile the right cat, does the microchip number match her paperwork digit for digit, do the documents open, and are the contact details the new ones everywhere they appear, including emergency contact fields owners often forget they filled in?
Send yourself a test where the service allows it, such as a password reset to the new address, to prove the route works before you actually need it. Only when every account passes those checks should you sign out of the old phone, wipe it, or let the old email address lapse. Keep the old number active a little longer if you can, because two-step verification codes are the most common stumbling block in the weeks after a change.
If Something Did Not Survive the Move
When a profile appears empty or a record seems lost, contact the service's support with her identifying details, the old and new email addresses, and your exported copies, and ask them to merge or restore rather than re-registering her from scratch. For the microchip registry especially, never create a second registration for the same chip number, as duplicate records can confuse a finder trying to reach you.
Having her essential history gathered in her KinsLe Pet Passport gives you one portable packet to check every transferred account against, so a missing vaccine entry or an outdated phone number stands out immediately instead of surfacing on the day she is lost or due at the vet.