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> this particular device is iPhone 4

Okay, so Wikipedia says the newest OS for that phone is iOS 7.1.2, which was released June 30, 2014. So you've got a phone with no OS updates, including security patches, in ~8 years. Considering that AFAICT Apple bakes webkit updates into the OS, your browser has not been patched in 8 years. Bluntly, HTTPS certs are the least of the reasons that your device has no business being on the internet.

> Bluntly, HTTPS certs are the least of the reasons that your device has no business being on the internet.

What a silly statement. Any device any user chooses to has business being on the internet. That's what the world wide web is.

So according to the link, you would have to have android 2.3.5 or earlier for it not to work (circa 2010. The final release of that branch was 2.3.7 which should work but maybe your phone provider didnt provide updates for your phone)

It looks like iPhone 4 runs up to iOS 7.1.2, and according to the above link, LE now requires iOS 10 or later.

In theory you can use MDM to add the LE root cert to your phone's certificate store.

How old is your phone? Android v2.3.6 and iPhone 5 are supported, which are pretty old.