From version 2.0.0 Phoenix works in a different way. They only use one channel instead of multiple ones.
Splicing allows altering channels by adding or removing funds. Instead of managing multiple channels, the app only has one single channel, which will then be modified depending on usage. This brings significant improvements:
On-chain swaps (swap-in or swap-out) are now trustless.
The static 1% fee for incoming payments that need new channels has been removed. Instead users pay the mining fee for the splicing operation.
That fee cannot exceed the maximum fee set by the user (in settings > channels management). Default maximum is 5000 sat.
A notification is displayed when an incoming payment is rejected because of the fee.
The fee for outgoing Lightning payments is now static (0.4 %) and is displayed before sending the payment.
Unconfirmed on-chain transactions can be accelerated.