I plan to get an ASUS TUF F15 Gaming Laptop($500), because I want it to be high speed, excellent display graphics & also excellent audio. (Amazon)
Also it has a removable battery for OpSec reasons, removable hard drive & upgradable RAM.
I will have my OS encrypted with Veracrypt, seems that is the best way to make your data uncrackable. I guess a 194 bit password is the minimum length one should use(YMMV). I also like veracrypt because it has decoy OS's/logins. Lastly, there is no need for me to enter in a 194 bit long password, what i will do instead is first log into the 1st layer veracrypt login/OS, which will have gigabytes of random code, that will have my 194 bit passphrase hidden in it, i search for my 8 character keyword then copy the 194 bit password then paste it into my final real 2nd later veracrypted OS login. I will also have my 194 passphrase backed up & archived/hidden online, on a file uploading site, or archive.org.
In regards to what smartphone I will choose, I will either choose grapheneOS or maybe a linux based smartphone OS. There are specific things I want the OS to do, features. And I guess I might have to pay someone to code this for me, if I cant get the grapheneOS development team to do it. With a linux based OS, program code can easily be created, & python can be run, etc, it appears. Not sure about grapheneOS.
I'm not sure if I could pay someone to customize/enhance my grapheneOS, but I'm pretty sure I could with a linux OS. I've never owned a grapheneOS before. Also lastly, I am researching about encrypted SIM cards & eSIM services & also IMEI ID#. Any advice is welcome! -Thanks.