Was it possible to store bitcoin in the phone in 2014 and were there any applications for this at that time? Or was it meant to store information regarding bitcoin in the internal memory of the phone or memory card?
CP models way back in 2014 are capable enough to store data and I think Bitcoin mobile apps are already available in 2014.
If this whole story is true, then without phone and paper, of course, BTC are lost forever and ever.
Indeed, the community might have an idea but with the backup gone all of it seems impossible because this certain John is unreachable. I hope for OP to find John and retrieve his lost Bitcoin.
One main thing that boggles my mind too on which its impossible for someone to agree on getting some loan of 300k just because someone had suggest him to buy bitcoin and also this man met on via
Tinder and he do even believed about religious matters which is really that impossible for someone to do give out much trust in a short time.
Sometimes unexpected things happen. Just like how we stumble on this forum and start discussing topics like this.
i have created a new wallet Can I restore my old wallet data with the purchase reference number through my Visa Card ?
Try to recall if you bought your BTC in a centralized exchange using your Visa Card as stated in an earlier reply, if you can't recall the exchange you can then try to trace your payment transaction, it might probably give you a clue and if you do bought it in a centralized exchange and never withdrawn it, the next thing is follow what Pmalek said.
It wouldn't be the first time something like that happened. But let's say that John really purchased those coins for him, he didn't get scammed, and the whole story is true. His house burnt down destroying his backup. The best thing that can happen is if John has a copy of the seed/private keys and he managed to get hold of him. Doubtful. The second-best thing is if the coins are stored on a centralized exchange where OP underwent KYC and he can get back into his account by proving who he is and restoring the password through email.
When we are on the subject of KYC, did you have to do identity verification on the site where you bought the coins or did John maybe ask you for your personal documents?