Cool! Check out the on chain fee you need to pay to open your channel and also the fee that Phoenix charges you to open the channel to you. I believe that's 1% of the amount you are receiving with a minimum of 3000 sats. I think it's very reasonable, but for small amounts might not work for some people, so it'd be better to do a larger first transaction to open the channel.

The idea behind it simple. You open a channel with one of you wallets, Electrum for example, and send some sats through it to the other wallet, Phoenix, which will open a channel to you (from their node) with a larger inbound capacity than the amount sent, and charge you a fee to do so.