If the Lightning node is not running on your phone, you only have a few other options:

1. You run the node on your own computer, such as a Start9 or Umbrel, or even an Alby Hub instance installed to your PC, so long as you keep it online 24/7.

2. You run the node on someone else's computer, such as Alby's cloud option for running Alby Hub, or Voltage.

3. Someone else runs the node on their computer, such as if you have an Uncle Jim you trust who could host your wallet, or use a custodial option such as CoinOS or MiniBits.

The "Primal achetecture" option would be most like option 3, where someone else runs the node on their computer.