Are Mobile Phone Monero Wallets Bad Security Wise?

My understanding is that mobile operating systems, especially ones like grapheneos, are significantly more secure than desktops.

That being said, are there any good libre monero wallets for mobile that protect your cryptographic keys with the highest possible security, while still having all the features of the official client and zero telemetry of any kind?

Better yet, is there an app that can manage multiple currencies, or would it be better to have like a different app for monero and bitcoin? Thanks in advance.