In which country do you live?
And yes, the best practice is to use crypto wallets & apps from a desktop computer only, where we can - to a large extent - control the parameters of our communication (through VPN's, Tor, etc.).
And if a microwaves phone is required, be it a Linux phone, like the Pinephone - because on an Android or iPhone, the bad actors your government is referring to have access to your data (Google & Apple in the first place).
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The Philippines. I observe just recently every time I do an online transaction, I now receive a notification to register my SIM. When I bought my phone, it has already been registered. So this is a kind of registration that has a different purpose in mind. I forgot the exact month they passed the SIM Registration ACT.