The main message I take from this story is that a decent quorum of consumers want Apple to offer a smaller phone in each generation. The OP seems not to have minded having to upgrade eventually, just not to a “virtual tablet.” I’ve heard others express the same desire.
https://www.apple.com/by/iphone-12/specs/ (12 mini)
https://support.apple.com/en-us/111873
I would recommend to return the phone and get the 13 mini which should last awhile