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You shouldn't be using a mobile phone as your main Bitcoin wallet. Here's why:
https://bitcointalk.org/index.php?topic=5463259.msg62732682#msg62732682Regarding Intel and AMD chips, their RNGs aren't being used to generate the entropy, right?
They are. When you request from your computer to generate a random number, it utilizes
RDRAND, which varies slightly as instruction from Intel to AMD. It's basically the same functionality. From the link, you can read the "Reception" part to confirm that engineers can insert backdoors there.
When you say that Intel and AMD's RNGs can't be verified, I doubt it's weak and affects seed generation. Otherwise, almost all wallets generated on such chips wouldn't be secure, and we would have many complaints and reports of mysteriously lost coins.
I have never heard of a case where someone lost bitcoin because backdoored RNG, but just as we can't verify it's generating true randomness, we can't complain they're stealing bitcoin either. I mean, think about it. You wake up the next morning, and your wallet is emptied. What do you do? You tell a journalist that AMD and Intel insert backdoors? With what evidence?