As posted by nostr:npub1q46m7q7zv8qe2zqffhhjnj558fdtzjxy7akr0x9ytwa3zc4zhpus0m8rmu earlier :

anonymous phone ☎️

1.) buy a pixel 3a or higher refurbished or used

2.) flash calyxOS or grapheneOS to it

3.) buy a eSIM "data only" on bitrefill.com (160 countries supported)

buy with lightning, use one time email

4.) scan eSIM QR ---> phone does the setup

4.) use simpleX for voice and video calls

5.) firefox klar for web browsing

i think this setup is quite good

you only cant call people on their phonenumber