This is a limitation of Trezor products, not mobile wallet devs. Trezor doesn't use Bluetooth to transmit and receive data (transaction binaries in your case). If you can afford it, Blockstream's Green is able to sign transactions via Bluetooth. You can get fully set up with only the hardware wallet and your phone. 

rustaceanrob

bitcoin

Do you think the companion apps for hardware wallets are sufficient?

Checking sats via xpub is not a problem. Yes, I know BlueWallet. There is the Trezor Suite Mobile, but it only supports watching your funds by putting xpub there, and there is no Tor at the moment.

What I am missing is an android wallet app that can spend sats by using Trezor (see my original comment). I want to avoid using laptop and make onchain payments just with a smartphone.

...i know about trezor suite web application. But my demand is to have a native android app.