diff --git a/cassandra-schema.cql b/cassandra-schema.cql
index bbeefe5b6e3..0e143beeacf 100644
--- a/cassandra-schema.cql
+++ b/cassandra-schema.cql
@@ -678,7 +678,6 @@ CREATE TABLE brig_test.user (
     managed_by int,
     name text,
     password blob,
-    phone text,
     picture list<blob>,
     provider uuid,
     searchable boolean,
diff --git a/changelog.d/0-release-notes/WPB-10058 b/changelog.d/0-release-notes/WPB-10058
new file mode 100644
index 00000000000..8f9c066875b
--- /dev/null
+++ b/changelog.d/0-release-notes/WPB-10058
@@ -0,0 +1 @@
+To remove phone keys from brig's `user_keys` table an ad hoc data-migration can be run. See PR https://github.com/wireapp/wire-server/pull/4146 which contains the implementation.
diff --git a/changelog.d/0-release-notes/WPB-10058-5xx b/changelog.d/0-release-notes/WPB-10058-5xx
new file mode 100644
index 00000000000..e884d0434be
--- /dev/null
+++ b/changelog.d/0-release-notes/WPB-10058-5xx
@@ -0,0 +1,4 @@
+Because the `phone` column is deleted from Brig's `user` table in a schema
+migration, temporarily there might be 5xx errors during deployment if Wire
+server 5.4.0 was not deployed previously. To avoid these errors, please deploy
+the Wire server 5.4.0 release first.
diff --git a/changelog.d/2-features/WPB-10058 b/changelog.d/2-features/WPB-10058
new file mode 100644
index 00000000000..02fab832d8c
--- /dev/null
+++ b/changelog.d/2-features/WPB-10058
@@ -0,0 +1 @@
+DB migration for dropping `phone` column from `user` table
diff --git a/libs/wire-subsystems/src/Wire/StoredUser.hs b/libs/wire-subsystems/src/Wire/StoredUser.hs
index b2ace0784cb..6a716ba04d6 100644
--- a/libs/wire-subsystems/src/Wire/StoredUser.hs
+++ b/libs/wire-subsystems/src/Wire/StoredUser.hs
@@ -21,7 +21,6 @@ data StoredUser = StoredUser
     name :: Name,
     pict :: Maybe Pict,
     email :: Maybe Email,
-    phone :: Maybe Phone,
     ssoId :: Maybe UserSSOId,
     accentId :: ColourId,
     assets :: Maybe [Asset],
diff --git a/libs/wire-subsystems/src/Wire/UserStore/Cassandra.hs b/libs/wire-subsystems/src/Wire/UserStore/Cassandra.hs
index cba7356f22e..b6662fbac63 100644
--- a/libs/wire-subsystems/src/Wire/UserStore/Cassandra.hs
+++ b/libs/wire-subsystems/src/Wire/UserStore/Cassandra.hs
@@ -127,7 +127,7 @@ lookupLocaleImpl u = do
 
 selectUser :: PrepQuery R (Identity UserId) (TupleType StoredUser)
 selectUser =
-  "SELECT id, name, picture, email, phone, sso_id, accent_id, assets, \
+  "SELECT id, name, picture, email, sso_id, accent_id, assets, \
   \activated, status, expires, language, country, provider, service, \
   \handle, team, managed_by, supported_protocols \
   \FROM user where id = ?"
@@ -166,7 +166,7 @@ updateUserToTombstone :: PrepQuery W (AccountStatus, Name, ColourId, Pict, [Asse
 updateUserToTombstone =
   "UPDATE user SET status = ?, name = ?,\
   \ accent_id = ?, picture = ?, assets = ?, handle = null, country = null,\
-  \ language = null, email = null, phone = null, sso_id = null WHERE id = ?"
+  \ language = null, email = null, sso_id = null WHERE id = ?"
 
 statusSelect :: PrepQuery R (Identity UserId) (Identity (Maybe AccountStatus))
 statusSelect = "SELECT status FROM user WHERE id = ?"
diff --git a/nix/wire-server.nix b/nix/wire-server.nix
index 6fafadb5efa..d052b10c7d6 100644
--- a/nix/wire-server.nix
+++ b/nix/wire-server.nix
@@ -477,7 +477,7 @@ let
       out = import ./all-toplevel-derivations.nix {
         inherit (pkgs) lib;
         fn = mk;
-        # more than two takes more than 32GB of RAM, so this is what 
+        # more than two takes more than 32GB of RAM, so this is what
         # we're limiting ourselves to
         recursionDepth = 2;
         keyFilter = k: k != "passthru";
diff --git a/services/brig/brig.cabal b/services/brig/brig.cabal
index 49d45527d52..fd3434fe99d 100644
--- a/services/brig/brig.cabal
+++ b/services/brig/brig.cabal
@@ -188,6 +188,7 @@ library
     Brig.Schema.V79_ConnectionRemoteIndex
     Brig.Schema.V80_KeyPackageCiphersuite
     Brig.Schema.V81_AddFederationRemoteTeams
+    Brig.Schema.V82_DropPhoneColumn
     Brig.Schema.V_FUTUREWORK
     Brig.Team.API
     Brig.Team.DB
diff --git a/services/brig/src/Brig/Schema/Run.hs b/services/brig/src/Brig/Schema/Run.hs
index 049a51e5f5f..be608d28578 100644
--- a/services/brig/src/Brig/Schema/Run.hs
+++ b/services/brig/src/Brig/Schema/Run.hs
@@ -56,6 +56,7 @@ import Brig.Schema.V78_ClientLastActive qualified as V78_ClientLastActive
 import Brig.Schema.V79_ConnectionRemoteIndex qualified as V79_ConnectionRemoteIndex
 import Brig.Schema.V80_KeyPackageCiphersuite qualified as V80_KeyPackageCiphersuite
 import Brig.Schema.V81_AddFederationRemoteTeams qualified as V81_AddFederationRemoteTeams
+import Brig.Schema.V82_DropPhoneColumn qualified as V82_DropPhoneColumn
 import Cassandra.MigrateSchema (migrateSchema)
 import Cassandra.Schema
 import Control.Exception (finally)
@@ -118,7 +119,8 @@ migrations =
     V78_ClientLastActive.migration,
     V79_ConnectionRemoteIndex.migration,
     V80_KeyPackageCiphersuite.migration,
-    V81_AddFederationRemoteTeams.migration
+    V81_AddFederationRemoteTeams.migration,
+    V82_DropPhoneColumn.migration
     -- FUTUREWORK: undo V41 (searchable flag); we stopped using it in
     -- https://github.com/wireapp/wire-server/pull/964
     --
diff --git a/services/brig/src/Brig/Schema/V82_DropPhoneColumn.hs b/services/brig/src/Brig/Schema/V82_DropPhoneColumn.hs
new file mode 100644
index 00000000000..dc086e04a60
--- /dev/null
+++ b/services/brig/src/Brig/Schema/V82_DropPhoneColumn.hs
@@ -0,0 +1,35 @@
+{-# LANGUAGE QuasiQuotes #-}
+
+-- This file is part of the Wire Server implementation.
+--
+-- Copyright (C) 2023 Wire Swiss GmbH <opensource@wire.com>
+--
+-- This program is free software: you can redistribute it and/or modify it under
+-- the terms of the GNU Affero General Public License as published by the Free
+-- Software Foundation, either version 3 of the License, or (at your option) any
+-- later version.
+--
+-- This program is distributed in the hope that it will be useful, but WITHOUT
+-- ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+-- FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
+-- details.
+--
+-- You should have received a copy of the GNU Affero General Public License along
+-- with this program. If not, see <https://www.gnu.org/licenses/>.
+
+module Brig.Schema.V82_DropPhoneColumn
+  ( migration,
+  )
+where
+
+import Cassandra.Schema
+import Imports
+import Text.RawString.QQ
+
+migration :: Migration
+migration =
+  Migration 82 "Drop phone column from user table" $ do
+    schema'
+      [r|
+        ALTER TABLE user DROP phone
+     |]
diff --git a/tools/db/inconsistencies/src/DanglingUserKeys.hs b/tools/db/inconsistencies/src/DanglingUserKeys.hs
index 3d27d4c208c..1242a1a2972 100644
--- a/tools/db/inconsistencies/src/DanglingUserKeys.hs
+++ b/tools/db/inconsistencies/src/DanglingUserKeys.hs
@@ -82,7 +82,6 @@ data Inconsistency = Inconsistency
     time :: Writetime UserId,
     status :: Maybe (WithWritetime AccountStatus),
     userEmail :: Maybe (WithWritetime Email),
-    userPhone :: Maybe (WithWritetime Phone),
     inconsistencyCase :: Text
   }
   deriving (Generic)
@@ -130,13 +129,13 @@ instance Cql EmailKey where
 instance Aeson.ToJSON EmailKey where
   toJSON = Aeson.toJSON . emailKeyUniq
 
-type UserDetailsRow = (Maybe AccountStatus, Maybe (Writetime AccountStatus), Maybe Email, Maybe (Writetime Email), Maybe Phone, Maybe (Writetime Phone))
+type UserDetailsRow = (Maybe AccountStatus, Maybe (Writetime AccountStatus), Maybe Email, Maybe (Writetime Email))
 
 getUserDetails :: UserId -> Client (Maybe UserDetailsRow)
 getUserDetails uid = retry x5 $ query1 cql (params LocalQuorum (Identity uid))
   where
     cql :: PrepQuery R (Identity UserId) UserDetailsRow
-    cql = "SELECT status, writetime(status), email, writetime(email), phone, writetime(phone) from user where id = ?"
+    cql = "SELECT status, writetime(status), email, writetime(email) from user where id = ?"
 
 checkKey :: Logger -> ClientState -> EmailKey -> Bool -> IO (Maybe Inconsistency)
 checkKey l brig key repairData = do
@@ -179,16 +178,14 @@ checkUser l brig key uid time repairData = do
     Nothing -> do
       let status = Nothing
           userEmail = Nothing
-          userPhone = Nothing
           inconsistencyCase = "2."
       when repairData $ -- case 2.
         runClient brig $
           freeEmailKey l key
       pure . Just $ Inconsistency {userId = uid, ..}
-    Just (mStatus, mStatusWriteTime, mEmail, mEmailWriteTime, mPhone, mPhoneWriteTime) -> do
+    Just (mStatus, mStatusWriteTime, mEmail, mEmailWriteTime) -> do
       let status = WithWritetime <$> mStatus <*> mStatusWriteTime
           userEmail = WithWritetime <$> mEmail <*> mEmailWriteTime
-          userPhone = WithWritetime <$> mPhone <*> mPhoneWriteTime
           statusError = case mStatus of
             Nothing -> True
             Just Deleted -> True
diff --git a/tools/db/move-team/src/Schema.hs b/tools/db/move-team/src/Schema.hs
index fdf17e81cae..2249bb2f1a5 100644
--- a/tools/db/move-team/src/Schema.hs
+++ b/tools/db/move-team/src/Schema.hs
@@ -360,10 +360,10 @@ importBrigRichInfo Env {..} path = do
 
 -- brig.user
 
-type RowBrigUser = (Maybe UUID, Maybe [Float], Maybe Int32, Maybe Bool, Maybe [AssetIgnoreData], Maybe Ascii, Maybe Text, Maybe UTCTime, Maybe Text, Maybe Ascii, Maybe Int32, Maybe Text, Maybe Blob, Maybe Text, Maybe [Blob], Maybe UUID, Maybe Bool, Maybe UUID, Maybe Text, Maybe Int32, Maybe UUID)
+type RowBrigUser = (Maybe UUID, Maybe [Float], Maybe Int32, Maybe Bool, Maybe [AssetIgnoreData], Maybe Ascii, Maybe Text, Maybe UTCTime, Maybe Text, Maybe Ascii, Maybe Int32, Maybe Text, Maybe Blob, Maybe [Blob], Maybe UUID, Maybe Bool, Maybe UUID, Maybe Text, Maybe Int32, Maybe UUID)
 
 selectBrigUser :: PrepQuery R (Identity [UserId]) RowBrigUser
-selectBrigUser = "SELECT id, accent, accent_id, activated, assets, country, email, expires, handle, language, managed_by, name, password, phone, picture, provider, searchable, service, sso_id, status, team FROM user WHERE id in ?"
+selectBrigUser = "SELECT id, accent, accent_id, activated, assets, country, email, expires, handle, language, managed_by, name, password, picture, provider, searchable, service, sso_id, status, team FROM user WHERE id in ?"
 
 readBrigUser :: Env -> [UserId] -> ConduitM () [RowBrigUser] IO ()
 readBrigUser Env {..} uids =
@@ -371,7 +371,7 @@ readBrigUser Env {..} uids =
     paginateC selectBrigUser (paramsP LocalQuorum (pure uids) envPageSize) x5
 
 selectBrigUserAll :: PrepQuery R () RowBrigUser
-selectBrigUserAll = "SELECT id, accent, accent_id, activated, assets, country, email, expires, handle, language, managed_by, name, password, phone, picture, provider, searchable, service, sso_id, status, team FROM user"
+selectBrigUserAll = "SELECT id, accent, accent_id, activated, assets, country, email, expires, handle, language, managed_by, name, password, picture, provider, searchable, service, sso_id, status, team FROM user"
 
 readBrigUserAll :: Env -> ConduitM () [RowBrigUser] IO ()
 readBrigUserAll Env {..} =
@@ -388,7 +388,7 @@ exportBrigUserFull env path = do
 
 insertBrigUser :: PrepQuery W RowBrigUser ()
 insertBrigUser =
-  "INSERT INTO user (id, accent, accent_id, activated, assets, country, email, expires, handle, language, managed_by, name, password, phone, picture, provider, searchable, service, sso_id, status, team) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)"
+  "INSERT INTO user (id, accent, accent_id, activated, assets, country, email, expires, handle, language, managed_by, name, password, picture, provider, searchable, service, sso_id, status, team) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)"
 
 importBrigUser :: Env -> FilePath -> IO ()
 importBrigUser Env {..} path = do
diff --git a/tools/db/move-team/src/Types.hs b/tools/db/move-team/src/Types.hs
index 3f7ef7ebe36..2839331ccb1 100644
--- a/tools/db/move-team/src/Types.hs
+++ b/tools/db/move-team/src/Types.hs
@@ -104,8 +104,8 @@ deriving instance ToJSON TimeUuid
 
 deriving instance FromJSON TimeUuid
 
-instance (ToJSON a, ToJSON b, ToJSON c, ToJSON d, ToJSON e, ToJSON f, ToJSON g, ToJSON h, ToJSON i, ToJSON j, ToJSON k, ToJSON l, ToJSON m, ToJSON n, ToJSON o, ToJSON p, ToJSON q, ToJSON r, ToJSON s, ToJSON t, ToJSON u) => ToJSON ((,,,,,,,,,,,,,,,,,,,,) a b c d e f g h i j k l m n o p q r s t u) where
-  toJSON (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u) =
+instance (ToJSON a, ToJSON b, ToJSON c, ToJSON d, ToJSON e, ToJSON f, ToJSON g, ToJSON h, ToJSON i, ToJSON j, ToJSON k, ToJSON l, ToJSON m, ToJSON n, ToJSON o, ToJSON p, ToJSON q, ToJSON r, ToJSON s, ToJSON t) => ToJSON ((,,,,,,,,,,,,,,,,,,,) a b c d e f g h i j k l m n o p q r s t) where
+  toJSON (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t) =
     Array $
       V.fromList
         [ toJSON a,
@@ -127,14 +127,13 @@ instance (ToJSON a, ToJSON b, ToJSON c, ToJSON d, ToJSON e, ToJSON f, ToJSON g,
           toJSON q,
           toJSON r,
           toJSON s,
-          toJSON t,
-          toJSON u
+          toJSON t
         ]
 
-instance (FromJSON a, FromJSON b, FromJSON c, FromJSON d, FromJSON e, FromJSON f, FromJSON g, FromJSON h, FromJSON i, FromJSON j, FromJSON k, FromJSON l, FromJSON m, FromJSON n, FromJSON o, FromJSON p, FromJSON q, FromJSON r, FromJSON s, FromJSON t, FromJSON u) => FromJSON ((,,,,,,,,,,,,,,,,,,,,) a b c d e f g h i j k l m n o p q r s t u) where
+instance (FromJSON a, FromJSON b, FromJSON c, FromJSON d, FromJSON e, FromJSON f, FromJSON g, FromJSON h, FromJSON i, FromJSON j, FromJSON k, FromJSON l, FromJSON m, FromJSON n, FromJSON o, FromJSON p, FromJSON q, FromJSON r, FromJSON s, FromJSON t) => FromJSON ((,,,,,,,,,,,,,,,,,,,) a b c d e f g h i j k l m n o p q r s t) where
   parseJSON = withArray "Tuple" $ \case
-    (toList -> [a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u]) ->
-      (,,,,,,,,,,,,,,,,,,,,)
+    (toList -> [a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t]) ->
+      (,,,,,,,,,,,,,,,,,,,)
         <$> parseJSON a
         <*> parseJSON b
         <*> parseJSON c
@@ -155,5 +154,4 @@ instance (FromJSON a, FromJSON b, FromJSON c, FromJSON d, FromJSON e, FromJSON f
         <*> parseJSON r
         <*> parseJSON s
         <*> parseJSON t
-        <*> parseJSON u
     _ -> fail "Expected array of length 21"