Unable to understand how to move WhatsApp to a new iPhone

invalid@example.com (Perene), Perene
Tue, 16 Sep 2025 19:01:19 +0000
Mobile Devices

I think I did this before, yet can't recall what steps exactly, to make sure 100% of whatever I had in the old device, was kept intact.

Here's the situation:

- The old iPhone is the 7 Plus, the new, 15+, not configured yet.

I asked iTunes to do a local/full (and encrypted) of the 7 PLUS, so all apps, docs, photos, etc. were preserved.

- I have 2 phone numbers, one using regular WhatsApp, the other uses "Business".

What I want:

1) To turn 15+ into the MAIN DEVICE, instead of simply connecting as additional.
2) To connect 7+ as the additional device.
3) Preserve everything from the old phone. For the 2 numbers.

What I did so far:

- Connected the 7 PLUS into my PC and asked iTunes to do a full copy into my SSD;
- Purchased the 50 GB iCloud plan, and asked both numbers (in each WhatsApp) to save into iCloud. Which I did for both, unencrypted.

Once all of that was done, in theory this is what is left:

- a) Wipe the new iPhone 15+ and restore from the local iTunes backup (PC)...