Some iPhone WhatsApp users feedback that they can't download and install WhatsApp on iPhone 4, or phone number could not be verified and got this error "Can't register with this phone number. You can only register with the phone that was last used with WhatsApp on this phone". It seems that your phone number could not be verified, but it's actually for other reasons.
Since WhatsApp version 2.18.81 released in August 2018, WhatsApp requires iOS 8 and higher iOS. However, the iOS version of old device is limited, and the iPhone 4 cannot be upgraded to iOS version after iOS 7.1.2. And you can check it in AppStore, search and find WhatsApp in AppStore, scroll download and tap compatibility under Information, it shows "Requires iOS 8.0 or later. Compatible with iPhone."
How to fix?
There is no solution unless you use iPhone 5S and higher iPhone modes with iOS 8.0 and later.
How to Save WhatsApp data from the old iPhone 4?
If your iPhone 4 has used for a long time, there must be lots of WhatsApp data in WhatsApp application. If you plan to upgrade to new iPhone or Android Phone, how to save WhatsApp data from the old iPhone 4? Here we recommend to use the third party app - WhatsApp Pocket to backup and extract WhatsApp data from iPhone and iCloud backup directly. WhatsApp Pocket is a desktop application, it can backup, extract and recover WhatsApp content data from iPhone device, iTunes and iCloud backup to the computer. All WhatsApp data, including text messages, photos, audio and video files, contacts and more will be saved. WhatsApp chat content will be saved in the html file, and other media files will be saved as a single file.
You need to download and install it on on the computer, and connect your iPhone with the computer by USB cable.
Chat WhatsApp messager, Extract and recover WhatsApp message from iPhone, iTunes and iCloud backup.
For Windows & Mac OS X
It will automatically show your iPhone device, iTunes backup and iCloud backup in the product. You can choose someone to scan, the scanning process only read the data, it will not overwrite or damage the source data. After the scanning has completed, you can preview the WhatsApp content and select part of WhatsApp chat or the whole data to save them.
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