Why pay $250 for a smart phone, if you can buy a inexpensive Raspberry Pi4 at about $35 with a large memory stick or second hand harddrive that would do the same thing? There are plethora of tutorials out there on how to setup a node with a Raspberry Pi, so you do not need to struggle with some new phone to get the node running.
Storage will also not be a problem, because you can just install a new bigger harddrive or memory stick, when it is getting full.
Enjoy!