If running a full node for the purpose of helping the network, then I'm a little bit skeptical. A full node should preferably be up 24/7 and for a phone, It should be resource consuming to do so when it comes to the battery and also storage as years go by.

And If by that, it's just so the user is in full control of his transactions unlike with SPV wallets or closed source/centralized ones then, to be honest, I doubt that anyone cares that much. Not to buy another phone anyway.

I would rather go with something like Bitseed. It's a little bit more expensive, but it does the job perfectly and it's up 24/7 and it also lasts for years to come (1 TBB storage).

Given the specs of the phone I dont still think it is profitable enough to mine bitcoin using a phone. I think its not worth it given the value of that smartphone I guess it will already broke down even before you can mine the amount of the phone you bought. The phone has 4gb ram and a 646 gb storage, this mobile could run a 2 bitcoin codes given the specs but I still think its not profitable to use that phone.  But I am still open for correction, if there will be people who can profit enough more than the value of that phone in a few months then guess I am wrong.

It can be a step up in the field of crypto to get reputation on the global scale.

A full bitcoin node with only 64gb of storage? The blockchain size is larger than that and I don't expect this phone will maintain stability if you run it as a 'full node'. It supports extra memory though, but hey, that means you need to spend more money.

A pruned node is what you can run at best but even with that, you can't expect to use it without any problems. Why not build an SPV client for god's sake?

Running a full bitcoin node, in this case, does not mean mining bitcoin, Chen said. The new HTC device has the ability to hold the entire bitcoin ledger of transactions utilizing an SD card in the process, purchased separately, which is inserted into a slot on the phone.

Running a full bitcoin node on a phone comes with its limitations. HTC recommends that you connect the phone to Wi-Fi and plug it into a power source while it’s running the full node, and you’ll also need to buy an SD card with a capacity of 400GB or more if you want the phone to be able to hold a full copy of the Bitcoin ledger. The Exodus 1S will also not be able to operate as a mining node.