No, and you would not want one anyway.
A hardware wallet should be 100% offline.
No potential for it to send data someplace or for some other way to connect without the user physically doing it.

No potential for someone to install apps that may compromise security no possibility to run something that should not be run and so on.

-Dave

Hardware wallet are more secure than online wallets, but they are mostly connected to SPV client which makes them not private. Just as you can use Tor with other wallets, it can helps in anonymity, not security.

You have your phone on airplane mode, but it can easily be turned on. To discourage that kind of habit, it is best to remove the WiFi, Bluetooth, NFC and other components that can be used to connect to other devices and to the internet.

There are some hardware wallets that look like phones but they are actually hardware wallets, in first place this is Passport hardware wallet by Foundation.
Passport started as ColdCard fork but with open source software and hardware, with added improvements and much better look.
Keystone wallet also looks like smaller smartphone, and it only functions as hardware wallet.

You can use old smartphones for coins but I would not consider it to be safe as hardware wallet for several reasons, but you can use them in combination with other hardware wallets.

One guy even used old Nokia phone to turn it into Bitcoin wallet:
https://bitcointalk.org/index.php?topic=5420438.0

WiPhone can also be used for some Bitcoin wallet project:
https://bitcointalk.org/index.php?topic=5403646.0

Some voices are not convinced that everything can be properly turned off, see https://bitcointalk.org/index.php?topic=5377997
And, in your case at least, the point it to not turn everything off and use it as every day smartphone, isn't it? And that's, by far, much riskier.

Even if there was something like that, why would you opt to use that instead of a standalone device that you only connect to when you need it to sign transactions and move your crypto? A phone that you use for all kinds of activities shouldn't be used as a storage for your private keys and seeds. Too many things could go wrong despite what the manufacturers say. Many people simply use their phones as a testing ground for games and dubious apps. They allow permissions and give apps rights without considering what it means. That's not an environment for your digital assets and their signing keys.

I doubt you will have much success trying that. Those components are surely all soldered to the main board, and unless you know what you are doing and have an engineering background, you are more than likely to destroy your phone. All the antennas and chips can be disabled on the software side, but who knows who and what can turn them on again if required to. 

I thought they were a fork of Trezor's codebase. Doesn't ColdCard work with a license that doesn't allow anyone to redistribute, use, or modify their code for their own purposes? Or maybe that wasn't the case when Passport forked it...

ColdCard used some parts of Trezor code few years ago, and even if NVK keeps making excuses about it I posted proof of Trezor developer confirming this.
When Passport foundation hardware wallet was released they initially used original ColdCard code that was modified, after that NVK from ColdCard decided to change code from open source to common clause.
So the main reason for ColdCard changing their license is because they don't want people using any of their code 

Do you mean that inside your phone there is a "cold storage build-in wallet" or just a wallet that connects to hardware wallets?
I think Galaxy S10 can do that and I read somewhere that they have a phone that works as a full node, syncs, and you can run it as cold storage but I don't remember the exact name.

I didn't even know that the Samsung Blockchain Wallet has been launched since 2019, I didn't find a review from the forum regarding that information or maybe I have missed it. I've accessed the Galaxy store at https://galaxystore.samsung.com/prepost/000006169962 and found that the app has 0 user reviews and even though I don't get any information on installed apps.

If sensitive data from phrase can be backed up to cloud samsung without notification to user then it will be dangerous, but so far the backup to cloud samsung feature is not available and user can only backup recovery phrase for manual save for personal, but I also can't trust that app is open source. But regarding security, in October a vulnerability was detected in the application with the description "Intent redirection vulnerability in Samsung Blockchain Wallet prior to version 1.3.02.8 allows attackers to execute privileged actions." but the information has been added to samsung security website, maybe they have fixed the problem.

I didn't research this Saga Phone deeper, and I didn't test it myself, but I don't consider this shitcoin wallet to be airgapped since it functions similar like regular smartphoens.
When we know how many times Solana shitchain stopped working for various reasons, makes me trust even less their magical Saga wallet.
Any device that have bluetooth, wifi, nfc, phone aim tower connection, and internet connection, can't be considered airgapped device.
I don't know how their seed vault works (could be similar like Samsung and Google phones), but I wouldn't waste a single sat on this presale ^(scam).

Phones TPM speak PKCS11. As long as you're willing write in the native language (Kotlin or Objective-C), and the TPM lists EC as a supported feature (they all do RSA but EC is present maybe 50% of the time?), then you can do hardware exponentiation and signing. Vaults on phones are "fairly" well implemented from my experience, the material is correctly enclaved to the binary that created the entry, and with the proper options at creation, it will never reveal the private data.

Phones as a primary hardware wallet are useless, but as a secondary signer in a multisig scheme, why not?