They have no minimum for private/non-routing channels
I run a lightning node at home with a dozen channels, but I only have one channel on my phone, with the Zeus LSP.
There are already so many potential problems you can run into when using a phone node, so I like to keep it simple for channels and make sure I have a peer who is dedicated to routing and having good uptime.
You should be able to open a channel with them right in the app, it’s a button called “connect to LSP”. I’ll also give you their pubkey here.
Mobile, self-custodial lightning where you run all the backend locally on your device is really cool, but it’s still a bit of a complicated set up at the current time. I can give you some tips and help you troubleshooting the channels you currently have, but my personal recommendation is to peer with a dedicated routing node.
Again, I think mobile lightning is incredibly cool. But especially if you’re already running a full, dedicated node somewhere else, 1 channel should be all you need to cover on the go payments. Think of it as a mobile lightning checking account which you could sweep to your main node whenever necessary.
nostr:npub1xnf02f60r9v0e5kty33a404dm79zr7z2eepyrk5gsq3m7pwvsz2sazlpr5 pubkey: 031b301307574bbe9b9ac7b79cbe1700e31e544513eae0b5d7497483083f99e581 
