Remote signing is a great concept, but not many clients support it right now.
If you want to play with remote signing, then this is the device I'm using:
https://shop.lnbits.com/product/nsec-remote-nostr-signer
My daily driver, however is getalby.com which I use for desktops.
I'm mostly iPhone, which has limited options, but this is the one most people use: