I can just use any BIP39 seed phrase.
Discussion
Here’s why it’s a bad idea to put existing seed phrases into a new wallet you haven’t tested before.
This one automatically backed it up to iCloud without asking me if I wanted to do that. In this case, it’s no big deal because I used an empty Spark wallet that I only keep for testing, but it didn’t inform me ahead of time, so it’s too late to reconsider.
Yes, but I did for test, not to put funds on it. I would never import a seed that I use on it. It's just for test.
So this wallet does not support Lightning, just native Spark and something called USDB? What even is that?
As you are testing with Iphone, is this stable?