One summer I pulled all of the furniture in our bedroom about 18in out from the walls so I could more quickly catch and remove the 3am rodent deliveries.
The same cat would bring a mouse to any houseguest we hosted for more than a day or two. I had to warn them to prepare for a 3-4am welcome present.
I usually move on once it's time for a battery replacement - I can get ~$100-150 back by selling the old phone and I get a newer camera out of the upgrade at the same time.
It works out to be something like $8-10/mo spent in the end (or ~$12/mo if I keep the old phone for some reason) so it's not terribly expensive in the end.
Assuming that model can be unlocked you'd usually enable developer options in Android settings, toggle the bootloader unlock option there then reboot to the bootloader and finish unlocking (and wiping) the phone.
There's some Samsung fuckery requiring button presses and/or a cable plugged into the phone at the right time during boot to get into different bootloader modes, the exact buttons and cable plugging sequence vary by model so Google and see if you can find an XDA thread or something.
The Russian navy eh? I'm sure this will go swimmingly.