SBW is the lowest time preference on the market
v2.5.2 is out.
Now you can attach external wallets by providing their BIP39 recovery phrases.
Here's a screenshot which shows an example where a single SBW app contains 4 types of wallets including an attached one.
I'm here to help with that
nostr:npub1chxa2um7gl65ymyaagjrqys39mtzlwnm2drcs6qkqmme7k4edq4qghrjdd is testnet mode within SBW on the roadmap? It would be very useful when teaching new bitcoiners.
It's a bit tricky topic, there used to be Testnet SBW on play market earlier and it was used by scammers to trick people that they've sent or received some real btc. (Despite all the warnings in an app).
I think play store is not a place for it but I can publish Testnet version as APK file in github releases, at least it's less accessible there.