diff --git a/eclair-core/src/main/scala/fr/acinq/eclair/Features.scala b/eclair-core/src/main/scala/fr/acinq/eclair/Features.scala
index 5104f7777b..12e5127208 100644
--- a/eclair-core/src/main/scala/fr/acinq/eclair/Features.scala
+++ b/eclair-core/src/main/scala/fr/acinq/eclair/Features.scala
@@ -312,6 +312,11 @@ object Features {
     val mandatory = 60
   }
 
+  case object PhoenixZeroReserve extends Feature with InitFeature with ChannelTypeFeature with PermanentChannelFeature {
+    val rfcName = "phoenix_zero_reserve"
+    val mandatory = 128
+  }
+
   /** This feature bit indicates that the node is a mobile wallet that can be woken up via push notifications. */
   case object WakeUpNotificationClient extends Feature with InitFeature {
     val rfcName = "wake_up_notification_client"
@@ -401,7 +406,8 @@ object Features {
     AsyncPaymentPrototype,
     SplicePrototype,
     OnTheFlyFunding,
-    FundingFeeCredit
+    FundingFeeCredit,
+    PhoenixZeroReserve
   )
 
   // Features may depend on other features, as specified in Bolt 9.
diff --git a/eclair-core/src/main/scala/fr/acinq/eclair/channel/ChannelFeatures.scala b/eclair-core/src/main/scala/fr/acinq/eclair/channel/ChannelFeatures.scala
index ad4799e909..7ca5b539b2 100644
--- a/eclair-core/src/main/scala/fr/acinq/eclair/channel/ChannelFeatures.scala
+++ b/eclair-core/src/main/scala/fr/acinq/eclair/channel/ChannelFeatures.scala
@@ -118,17 +118,6 @@ object ChannelTypes {
     override def commitmentFormat: CommitmentFormat = ZeroFeeHtlcTxAnchorOutputsCommitmentFormat
     override def toString: String = s"anchor_outputs_zero_fee_htlc_tx${if (scidAlias) "+scid_alias" else ""}${if (zeroConf) "+zeroconf" else ""}"
   }
-  case class SimpleTaprootChannelsPhoenix(scidAlias: Boolean = false, zeroConf: Boolean = false) extends SupportedChannelType {
-    /** Known channel-type features */
-    override def features: Set[ChannelTypeFeature] = Set(
-      if (scidAlias) Some(Features.ScidAlias) else None,
-      if (zeroConf) Some(Features.ZeroConf) else None,
-      Some(Features.SimpleTaprootChannelsPhoenix),
-    ).flatten
-    override def paysDirectlyToWallet: Boolean = false
-    override def commitmentFormat: CommitmentFormat = PhoenixSimpleTaprootChannelCommitmentFormat
-    override def toString: String = s"simple_taproot_channel_phoenix${if (scidAlias) "+scid_alias" else ""}${if (zeroConf) "+zeroconf" else ""}"
-  }
   case class SimpleTaprootChannelsStaging(scidAlias: Boolean = false, zeroConf: Boolean = false) extends SupportedChannelType {
     /** Known channel-type features */
     override def features: Set[ChannelTypeFeature] = Set(
@@ -145,6 +134,16 @@ object ChannelTypes {
     override def features: Set[InitFeature] = featureBits.activated.keySet
     override def toString: String = s"0x${featureBits.toByteVector.toHex}"
   }
+
+  // Phoenix uses custom channel types, that we may remove in the future.
+  case object SimpleTaprootChannelsPhoenix extends SupportedChannelType {
+    /** Known channel-type features */
+    override def features: Set[ChannelTypeFeature] = Set(Features.PhoenixZeroReserve, Features.SimpleTaprootChannelsPhoenix)
+    override def paysDirectlyToWallet: Boolean = false
+    override def commitmentFormat: CommitmentFormat = PhoenixSimpleTaprootChannelCommitmentFormat
+    override def toString: String = "phoenix_simple_taproot_channel"
+  }
+
   // @formatter:on
 
   private val features2ChannelType: Map[Features[_ <: InitFeature], SupportedChannelType] = Set(
@@ -164,10 +163,7 @@ object ChannelTypes {
     AnchorOutputsZeroFeeHtlcTx(zeroConf = true),
     AnchorOutputsZeroFeeHtlcTx(scidAlias = true),
     AnchorOutputsZeroFeeHtlcTx(scidAlias = true, zeroConf = true),
-    SimpleTaprootChannelsPhoenix(),
-    SimpleTaprootChannelsPhoenix(zeroConf = true),
-    SimpleTaprootChannelsPhoenix(scidAlias = true),
-    SimpleTaprootChannelsPhoenix(scidAlias = true, zeroConf = true),
+    SimpleTaprootChannelsPhoenix,
     SimpleTaprootChannelsStaging(),
     SimpleTaprootChannelsStaging(zeroConf = true),
     SimpleTaprootChannelsStaging(scidAlias = true),
@@ -188,7 +184,7 @@ object ChannelTypes {
     if (canUse(Features.SimpleTaprootChannelsStaging)) {
       SimpleTaprootChannelsStaging(scidAlias, zeroConf)
     } else if (canUse(Features.SimpleTaprootChannelsPhoenix)) {
-      SimpleTaprootChannelsPhoenix(scidAlias, zeroConf)
+      SimpleTaprootChannelsPhoenix
     } else if (canUse(Features.AnchorOutputsZeroFeeHtlcTx)) {
       AnchorOutputsZeroFeeHtlcTx(scidAlias, zeroConf)
     } else if (canUse(Features.AnchorOutputs)) {
diff --git a/eclair-core/src/main/scala/fr/acinq/eclair/channel/fsm/Channel.scala b/eclair-core/src/main/scala/fr/acinq/eclair/channel/fsm/Channel.scala
index ccbbabc623..fbad954c02 100644
--- a/eclair-core/src/main/scala/fr/acinq/eclair/channel/fsm/Channel.scala
+++ b/eclair-core/src/main/scala/fr/acinq/eclair/channel/fsm/Channel.scala
@@ -30,6 +30,7 @@ import fr.acinq.eclair.blockchain._
 import fr.acinq.eclair.blockchain.bitcoind.ZmqWatcher
 import fr.acinq.eclair.blockchain.bitcoind.ZmqWatcher._
 import fr.acinq.eclair.blockchain.bitcoind.rpc.BitcoinCoreClient
+import fr.acinq.eclair.channel.ChannelTypes.SimpleTaprootChannelsPhoenix
 import fr.acinq.eclair.channel.Commitments.PostRevocationAction
 import fr.acinq.eclair.channel.Helpers.Closing.MutualClose
 import fr.acinq.eclair.channel.Helpers.Syncing.SyncResult
@@ -1113,8 +1114,8 @@ class Channel(val nodeParams: NodeParams, val channelKeys: ChannelKeys, val wall
                 // We only support updating phoenix channels to taproot: we ignore other attempts at upgrading the
                 // commitment format and will simply apply the previous commitment format.
                 val nextCommitmentFormat = msg.channelType_opt match {
-                  case Some(channelType: ChannelTypes.SimpleTaprootChannelsPhoenix) if parentCommitment.commitmentFormat == UnsafeLegacyAnchorOutputsCommitmentFormat =>
-                    log.info(s"accepting upgrade to $channelType during splice from commitment format ${parentCommitment.commitmentFormat}")
+                  case Some(ChannelTypes.SimpleTaprootChannelsPhoenix) if parentCommitment.commitmentFormat == UnsafeLegacyAnchorOutputsCommitmentFormat =>
+                    log.info(s"accepting upgrade to SimpleTaprootChannelsPhoenix during splice from commitment format ${parentCommitment.commitmentFormat}")
                     PhoenixSimpleTaprootChannelCommitmentFormat
                   case Some(channelType) =>
                     log.info(s"rejecting upgrade to $channelType during splice from commitment format ${parentCommitment.commitmentFormat}")
@@ -1181,7 +1182,7 @@ class Channel(val nodeParams: NodeParams, val channelKeys: ChannelKeys, val wall
           // We only support updating phoenix channels to taproot: we ignore other attempts at upgrading the
           // commitment format and will simply apply the previous commitment format.
           val nextCommitmentFormat = msg.channelType_opt match {
-            case Some(_: ChannelTypes.SimpleTaprootChannelsPhoenix) if parentCommitment.commitmentFormat == UnsafeLegacyAnchorOutputsCommitmentFormat => PhoenixSimpleTaprootChannelCommitmentFormat
+            case Some(ChannelTypes.SimpleTaprootChannelsPhoenix) if parentCommitment.commitmentFormat == UnsafeLegacyAnchorOutputsCommitmentFormat => PhoenixSimpleTaprootChannelCommitmentFormat
             case _ => parentCommitment.commitmentFormat
           }
           val fundingParams = InteractiveTxParams(
diff --git a/eclair-core/src/test/scala/fr/acinq/eclair/channel/InteractiveTxBuilderSpec.scala b/eclair-core/src/test/scala/fr/acinq/eclair/channel/InteractiveTxBuilderSpec.scala
index a5302ae7a9..9d27115cf0 100644
--- a/eclair-core/src/test/scala/fr/acinq/eclair/channel/InteractiveTxBuilderSpec.scala
+++ b/eclair-core/src/test/scala/fr/acinq/eclair/channel/InteractiveTxBuilderSpec.scala
@@ -825,7 +825,7 @@ class InteractiveTxBuilderSpec extends TestKitBaseClass with AnyFunSuiteLike wit
     val utxosA = Seq(150_000 sat)
     val fundingB1 = 90_000 sat
     val utxosB = Seq(130_000 sat)
-    withFixture(ChannelTypes.SimpleTaprootChannelsPhoenix(), fundingA1, utxosA, fundingB1, utxosB, FeeratePerKw(1000 sat), 660 sat, 0, RequireConfirmedInputs(forLocal = true, forRemote = true)) { f =>
+    withFixture(ChannelTypes.SimpleTaprootChannelsPhoenix, fundingA1, utxosA, fundingB1, utxosB, FeeratePerKw(1000 sat), 660 sat, 0, RequireConfirmedInputs(forLocal = true, forRemote = true)) { f =>
       import f._
 
       val probe = TestProbe()
@@ -2934,7 +2934,7 @@ class InteractiveTxBuilderSpec extends TestKitBaseClass with AnyFunSuiteLike wit
   test("invalid commit_sig (taproot)") {
     val (alice2bob, bob2alice) = (TestProbe(), TestProbe())
     val wallet = new SingleKeyOnChainWallet()
-    val params = createFixtureParams(ChannelTypes.SimpleTaprootChannelsPhoenix(), 100_000 sat, 25_000 sat, FeeratePerKw(5000 sat), 330 sat, 0)
+    val params = createFixtureParams(ChannelTypes.SimpleTaprootChannelsPhoenix, 100_000 sat, 25_000 sat, FeeratePerKw(5000 sat), 330 sat, 0)
     val alice = params.spawnTxBuilderAlice(wallet)
     val bob = params.spawnTxBuilderBob(wallet)
     alice ! Start(alice2bob.ref)
diff --git a/eclair-core/src/test/scala/fr/acinq/eclair/channel/states/a/WaitForAcceptChannelStateSpec.scala b/eclair-core/src/test/scala/fr/acinq/eclair/channel/states/a/WaitForAcceptChannelStateSpec.scala
index 5f79b82b2c..d82fe3ffea 100644
--- a/eclair-core/src/test/scala/fr/acinq/eclair/channel/states/a/WaitForAcceptChannelStateSpec.scala
+++ b/eclair-core/src/test/scala/fr/acinq/eclair/channel/states/a/WaitForAcceptChannelStateSpec.scala
@@ -110,7 +110,7 @@ class WaitForAcceptChannelStateSpec extends TestKitBaseClass with FixtureAnyFunS
   test("recv AcceptChannel (simple taproot channels phoenix)", Tag(ChannelStateTestsTags.OptionSimpleTaprootPhoenix)) { f =>
     import f._
     val accept = bob2alice.expectMsgType[AcceptChannel]
-    assert(accept.channelType_opt.contains(ChannelTypes.SimpleTaprootChannelsPhoenix()))
+    assert(accept.channelType_opt.contains(ChannelTypes.SimpleTaprootChannelsPhoenix))
     assert(accept.commitNonce_opt.isDefined)
     bob2alice.forward(alice)
     awaitCond(alice.stateName == WAIT_FOR_FUNDING_INTERNAL)
@@ -121,7 +121,7 @@ class WaitForAcceptChannelStateSpec extends TestKitBaseClass with FixtureAnyFunS
   test("recv AcceptChannel (simple taproot channels outputs, missing nonce)", Tag(ChannelStateTestsTags.OptionSimpleTaprootPhoenix)) { f =>
     import f._
     val accept = bob2alice.expectMsgType[AcceptChannel]
-    assert(accept.channelType_opt.contains(ChannelTypes.SimpleTaprootChannelsPhoenix()))
+    assert(accept.channelType_opt.contains(ChannelTypes.SimpleTaprootChannelsPhoenix))
     assert(accept.commitNonce_opt.isDefined)
     bob2alice.forward(alice, accept.copy(tlvStream = accept.tlvStream.copy(records = accept.tlvStream.records.filterNot(_.isInstanceOf[ChannelTlv.NextLocalNonceTlv]))))
     alice2bob.expectMsg(Error(accept.temporaryChannelId, MissingCommitNonce(accept.temporaryChannelId, TxId(ByteVector32.Zeroes), 0).getMessage))
diff --git a/eclair-core/src/test/scala/fr/acinq/eclair/channel/states/e/NormalSplicesStateSpec.scala b/eclair-core/src/test/scala/fr/acinq/eclair/channel/states/e/NormalSplicesStateSpec.scala
index 5f8c3db3fa..ff1645aa5e 100644
--- a/eclair-core/src/test/scala/fr/acinq/eclair/channel/states/e/NormalSplicesStateSpec.scala
+++ b/eclair-core/src/test/scala/fr/acinq/eclair/channel/states/e/NormalSplicesStateSpec.scala
@@ -757,7 +757,7 @@ class NormalSplicesStateSpec extends TestKitBaseClass with FixtureAnyFunSuiteLik
     import f._
 
     val htlcs = setupHtlcs(f)
-    initiateSplice(f, spliceIn_opt = Some(SpliceIn(400_000 sat)), channelType_opt = Some(ChannelTypes.SimpleTaprootChannelsPhoenix()))
+    initiateSplice(f, spliceIn_opt = Some(SpliceIn(400_000 sat)), channelType_opt = Some(ChannelTypes.SimpleTaprootChannelsPhoenix))
     assert(alice.commitments.active.head.commitmentFormat == PhoenixSimpleTaprootChannelCommitmentFormat)
     assert(alice.commitments.active.last.commitmentFormat == UnsafeLegacyAnchorOutputsCommitmentFormat)
     resolveHtlcs(f, htlcs)
@@ -767,7 +767,7 @@ class NormalSplicesStateSpec extends TestKitBaseClass with FixtureAnyFunSuiteLik
     import f._
 
     val htlcs = setupHtlcs(f)
-    initiateSplice(f, spliceIn_opt = Some(SpliceIn(400_000 sat)), channelType_opt = Some(ChannelTypes.SimpleTaprootChannelsPhoenix()))
+    initiateSplice(f, spliceIn_opt = Some(SpliceIn(400_000 sat)), channelType_opt = Some(ChannelTypes.SimpleTaprootChannelsPhoenix))
     assert(alice.commitments.active.head.commitmentFormat == ZeroFeeHtlcTxAnchorOutputsCommitmentFormat)
     assert(alice.commitments.active.last.commitmentFormat == ZeroFeeHtlcTxAnchorOutputsCommitmentFormat)
     resolveHtlcs(f, htlcs)
@@ -3724,7 +3724,7 @@ class NormalSplicesStateSpec extends TestKitBaseClass with FixtureAnyFunSuiteLik
     val htlcs = setupHtlcs(f)
 
     // Our first splice upgrades the channel to taproot.
-    val fundingTx1 = initiateSplice(f, spliceIn_opt = Some(SpliceIn(500_000 sat)), channelType_opt = Some(ChannelTypes.SimpleTaprootChannelsPhoenix()))
+    val fundingTx1 = initiateSplice(f, spliceIn_opt = Some(SpliceIn(500_000 sat)), channelType_opt = Some(ChannelTypes.SimpleTaprootChannelsPhoenix))
     checkWatchConfirmed(f, fundingTx1)
 
     // The first splice confirms on Bob's side.
@@ -3819,7 +3819,7 @@ class NormalSplicesStateSpec extends TestKitBaseClass with FixtureAnyFunSuiteLik
     val htlcs = setupHtlcs(f)
 
     // Our splice upgrades the channel to taproot.
-    val spliceTx = initiateSplice(f, spliceIn_opt = Some(SpliceIn(500_000 sat)), channelType_opt = Some(ChannelTypes.SimpleTaprootChannelsPhoenix()))
+    val spliceTx = initiateSplice(f, spliceIn_opt = Some(SpliceIn(500_000 sat)), channelType_opt = Some(ChannelTypes.SimpleTaprootChannelsPhoenix))
     assert(alice.commitments.active.head.commitmentFormat == PhoenixSimpleTaprootChannelCommitmentFormat)
     assert(alice.commitments.active.last.commitmentFormat == UnsafeLegacyAnchorOutputsCommitmentFormat)
     checkWatchConfirmed(f, spliceTx)
@@ -3860,7 +3860,7 @@ class NormalSplicesStateSpec extends TestKitBaseClass with FixtureAnyFunSuiteLik
     val htlcs = setupHtlcs(f)
 
     // Our splice upgrades the channel to taproot.
-    val spliceTx = initiateSplice(f, spliceIn_opt = Some(SpliceIn(500_000 sat)), channelType_opt = Some(ChannelTypes.SimpleTaprootChannelsPhoenix()))
+    val spliceTx = initiateSplice(f, spliceIn_opt = Some(SpliceIn(500_000 sat)), channelType_opt = Some(ChannelTypes.SimpleTaprootChannelsPhoenix))
     assert(alice.commitments.active.head.commitmentFormat == PhoenixSimpleTaprootChannelCommitmentFormat)
     assert(alice.commitments.active.last.commitmentFormat == UnsafeLegacyAnchorOutputsCommitmentFormat)
     checkWatchConfirmed(f, spliceTx)
@@ -3911,7 +3911,7 @@ class NormalSplicesStateSpec extends TestKitBaseClass with FixtureAnyFunSuiteLik
     val htlcs = setupHtlcs(f)
 
     // Our splice upgrades the channel to taproot.
-    val spliceTx = initiateSplice(f, spliceIn_opt = Some(SpliceIn(500_000 sat)), channelType_opt = Some(ChannelTypes.SimpleTaprootChannelsPhoenix()))
+    val spliceTx = initiateSplice(f, spliceIn_opt = Some(SpliceIn(500_000 sat)), channelType_opt = Some(ChannelTypes.SimpleTaprootChannelsPhoenix))
     assert(alice.commitments.active.head.commitmentFormat == PhoenixSimpleTaprootChannelCommitmentFormat)
     assert(alice.commitments.active.last.commitmentFormat == UnsafeLegacyAnchorOutputsCommitmentFormat)
     checkWatchConfirmed(f, spliceTx)
@@ -3947,7 +3947,7 @@ class NormalSplicesStateSpec extends TestKitBaseClass with FixtureAnyFunSuiteLik
     val htlcs = setupHtlcs(f)
 
     // Our splice upgrades the channel to taproot.
-    val spliceTx = initiateSplice(f, spliceIn_opt = Some(SpliceIn(500_000 sat)), channelType_opt = Some(ChannelTypes.SimpleTaprootChannelsPhoenix()))
+    val spliceTx = initiateSplice(f, spliceIn_opt = Some(SpliceIn(500_000 sat)), channelType_opt = Some(ChannelTypes.SimpleTaprootChannelsPhoenix))
     assert(alice.commitments.active.head.commitmentFormat == PhoenixSimpleTaprootChannelCommitmentFormat)
     assert(alice.commitments.active.last.commitmentFormat == UnsafeLegacyAnchorOutputsCommitmentFormat)
     assert(alice2blockchain.expectMsgType[WatchPublished].txId == spliceTx.txid)