Not true, if you are interested in security I would go with an unlocked google pixel 5 or higher, I don't know where you live but places like
https://swappa.com/listings/google-pixel-5?carrier=unlocked you can get them reasonably. make sure it's not from verizon or At&t (you want to buy one that was bought from google, typically it's the unlocked ones) when you get it you will want to unlock the bootloader and follow the instructions on
https://grapheneos.org/ to install, it's simple. It is the most secure and private OS for android there is at the moment.
- husky (Pixel 8 Pro)
- shiba (Pixel 8)
- felix (Pixel Fold)
- tangorpro (Pixel Tablet)
- lynx (Pixel 7a)
- cheetah (Pixel 7 Pro)
- panther (Pixel 7)
- bluejay (Pixel 6a)
- raven (Pixel 6 Pro)
- oriole (Pixel 6)
- barbet (Pixel 5a)
- redfin (Pixel 5) (extended support)
- bramble (Pixel 4a (5G)) (extended support)
- sunfish (Pixel 4a) (extended support)
- coral (Pixel 4 XL) (extended support)
- flame (Pixel 4) (extended support)
those are what they list as they support, it would be in your best interest to go with something that is not on it's extended support such as 5a or higher.
but 5 will be your cheapest option.
https://grapheneos.org/faq this answers alot of questions, and if you read through this you will see why graphene OS is a lot more secure.
The following is NOT true on any other phone but graphene OS
"activating airplane mode will fully disable the cellular radio transmit and receive capabilities, which will prevent your phone from being reached from the cellular network and stop your carrier (and anyone impersonating them to you) from tracking the device via the cellular radio The baseband implements other functionality such as Wi-Fi and GPS functionality, but each of these components is separately sandboxed on the baseband and independent of each other. Enabling airplane mode disables the cellular radio, but Wi-Fi can be re-enabled and used without activating the cellular radio again. This allows using the device as a Wi-Fi only device." Meaning that you can then connect VPN and be 100% secure with this device.