diff --git a/src/api/gramjs/methods/management.ts b/src/api/gramjs/methods/management.ts
index 6907c7cb0..f3efb1173 100644
--- a/src/api/gramjs/methods/management.ts
+++ b/src/api/gramjs/methods/management.ts
@@ -2,7 +2,9 @@ import { Api as GramJs } from '../../../lib/gramjs';
 
 import { invokeRequest } from './client';
 import { buildInputEntity, buildInputPeer } from '../gramjsBuilders';
-import type { ApiChat, ApiUser, OnApiUpdate } from '../../types';
+import type {
+  ApiChat, ApiError, ApiUser, OnApiUpdate,
+} from '../../types';
 import { addEntitiesWithPhotosToLocalDb } from '../helpers';
 import { buildApiExportedInvite, buildChatInviteImporter } from '../apiBuilders/chats';
 import { buildApiUser } from '../apiBuilders/users';
@@ -18,7 +20,12 @@ export function checkChatUsername({ username }: { username: string }) {
   return invokeRequest(new GramJs.channels.CheckUsername({
     channel: new GramJs.InputChannelEmpty(),
     username,
-  }));
+  }), undefined, true).catch((error) => {
+    if ((error as ApiError).message === 'USERNAME_INVALID') {
+      return false;
+    }
+    throw error;
+  });
 }
 
 export async function setChatUsername(
diff --git a/src/api/gramjs/methods/settings.ts b/src/api/gramjs/methods/settings.ts
index d24a04943..bde73865d 100644
--- a/src/api/gramjs/methods/settings.ts
+++ b/src/api/gramjs/methods/settings.ts
@@ -3,6 +3,8 @@ import { Api as GramJs } from '../../../lib/gramjs';
 
 import type {
   ApiAppConfig,
+  ApiChat,
+  ApiError,
   ApiLangString,
   ApiLanguage,
   ApiNotifyException,
@@ -52,7 +54,12 @@ export function updateProfile({
 }
 
 export function checkUsername(username: string) {
-  return invokeRequest(new GramJs.account.CheckUsername({ username }));
+  return invokeRequest(new GramJs.account.CheckUsername({ username }), undefined, true).catch((error) => {
+    if ((error as ApiError).message === 'USERNAME_INVALID') {
+      return false;
+    }
+    throw error;
+  });
 }
 
 export function updateUsername(username: string) {
diff --git a/src/components/common/UsernameInput.tsx b/src/components/common/UsernameInput.tsx
index a39f324a7..73bab511e 100644
--- a/src/components/common/UsernameInput.tsx
+++ b/src/components/common/UsernameInput.tsx
@@ -1,12 +1,15 @@
-import type { ChangeEvent } from 'react';
-import type { FC } from '../../lib/teact/teact';
 import React, {
   useState, useCallback, memo, useEffect, useMemo,
 } from '../../lib/teact/teact';
+import { getActions } from '../../global';
+
+import type { FC } from '../../lib/teact/teact';
 
 import { TME_LINK_PREFIX } from '../../config';
 import { debounce } from '../../util/schedulers';
+
 import useLang from '../../hooks/useLang';
+import usePrevious from '../../hooks/usePrevious';
 
 import InputText from '../ui/InputText';
 
@@ -15,14 +18,14 @@ type OwnProps = {
   asLink?: boolean;
   isLoading?: boolean;
   isUsernameAvailable?: boolean;
-  checkUsername: AnyToVoidFunction;
+  checkedUsername?: string;
   onChange: (value: string | false) => void;
 };
 
 const MIN_USERNAME_LENGTH = 5;
 const MAX_USERNAME_LENGTH = 32;
 const LINK_PREFIX_REGEX = /https:\/\/t\.me\/?/i;
-const USERNAME_REGEX = /^([a-zA-Z0-9_]+)$/;
+const USERNAME_REGEX = /^[^\d]([a-zA-Z0-9_]+)$/;
 
 const runDebouncedForCheckUsername = debounce((cb) => cb(), 250, false);
 
@@ -32,78 +35,84 @@ function isUsernameValid(username: string) {
     && USERNAME_REGEX.test(username);
 }
 
-const SettingsEditProfile: FC<OwnProps> = ({
+const UsernameInput: FC<OwnProps> = ({
   currentUsername,
   asLink,
   isLoading,
   isUsernameAvailable,
-  checkUsername,
+  checkedUsername,
   onChange,
 }) => {
+  const { checkUsername, checkPublicLink } = getActions();
   const [username, setUsername] = useState(currentUsername || '');
 
   const lang = useLang();
   const langPrefix = asLink ? 'SetUrl' : 'Username';
   const label = asLink ? lang('SetUrlPlaceholder') : lang('Username');
 
+  const previousIsUsernameAvailable = usePrevious(isUsernameAvailable);
+  const renderingIsUsernameAvailable = currentUsername !== username
+    ? (isUsernameAvailable ?? previousIsUsernameAvailable) : undefined;
+  const isChecking = username && currentUsername !== username && checkedUsername !== username;
+
   const [usernameSuccess, usernameError] = useMemo(() => {
     if (!username.length) {
       return [];
     }
 
     if (username.length < MIN_USERNAME_LENGTH) {
-      return [undefined, `${label} is too short`];
+      return [undefined, lang(`${langPrefix}InvalidShort`)];
     }
     if (username.length > MAX_USERNAME_LENGTH) {
-      return [undefined, `${label} is too long`];
+      return [undefined, lang(`${langPrefix}InvalidLong`)];
     }
     if (!USERNAME_REGEX.test(username)) {
-      return [undefined, `${label} contains invalid characters`];
+      return [undefined, lang(`${langPrefix}Invalid`)];
     }
 
-    if (isUsernameAvailable === undefined) {
+    if (renderingIsUsernameAvailable === undefined || isChecking) {
       return [];
     }
 
     // Variable `isUsernameAvailable` is initialized with `undefined`, so a strict false check is required
     return [
-      isUsernameAvailable ? lang(`${langPrefix}Available`, 'Username') : undefined,
-      isUsernameAvailable === false ? lang(`${langPrefix}InUse`) : undefined,
+      renderingIsUsernameAvailable ? lang(`${langPrefix}Available`, label) : undefined,
+      renderingIsUsernameAvailable === false ? lang(`${langPrefix}InUse`) : undefined,
     ];
-  }, [username, isUsernameAvailable, lang, langPrefix, label]);
+  }, [username, renderingIsUsernameAvailable, isChecking, lang, langPrefix, label]);
 
   useEffect(() => {
     setUsername(currentUsername || '');
   }, [asLink, currentUsername]);
 
-  const handleUsernameChange = useCallback((e: ChangeEvent<HTMLInputElement>) => {
+  const handleUsernameChange = useCallback((e: React.ChangeEvent<HTMLInputElement>) => {
     const newUsername = e.target.value.trim().replace(LINK_PREFIX_REGEX, '');
     setUsername(newUsername);
-    e.target.value = `${asLink ? TME_LINK_PREFIX : ''}${newUsername}`;
 
     const isValid = isUsernameValid(newUsername);
+    if (!isValid) return;
 
-    if (isValid) {
-      runDebouncedForCheckUsername(() => {
-        checkUsername({ username: newUsername });
-      });
-    }
+    onChange?.(newUsername);
 
-    if (onChange) {
-      onChange(isValid ? newUsername : false);
-    }
-  }, [asLink, checkUsername, onChange]);
+    runDebouncedForCheckUsername(() => {
+      if (newUsername !== currentUsername) {
+        const check = asLink ? checkPublicLink : checkUsername;
+        check({ username: newUsername });
+      }
+    });
+  }, [asLink, checkPublicLink, checkUsername, currentUsername, onChange]);
 
   return (
     <InputText
       value={`${asLink ? TME_LINK_PREFIX : ''}${username}`}
       onChange={handleUsernameChange}
-      label={label}
+      label={isChecking ? lang('Checking') : label}
       error={usernameError}
       success={usernameSuccess}
       readOnly={isLoading}
+      teactExperimentControlled
     />
   );
 };
 
-export default memo(SettingsEditProfile);
+export default memo(UsernameInput);
diff --git a/src/components/left/settings/SettingsEditProfile.tsx b/src/components/left/settings/SettingsEditProfile.tsx
index 2675b2883..39eca149e 100644
--- a/src/components/left/settings/SettingsEditProfile.tsx
+++ b/src/components/left/settings/SettingsEditProfile.tsx
@@ -17,6 +17,7 @@ import useLang from '../../../hooks/useLang';
 import { selectCurrentLimit } from '../../../global/selectors/limits';
 import renderText from '../../common/helpers/renderText';
 import useHistoryBack from '../../../hooks/useHistoryBack';
+import usePrevious from '../../../hooks/usePrevious';
 
 import AvatarEditable from '../../ui/AvatarEditable';
 import FloatingActionButton from '../../ui/FloatingActionButton';
@@ -37,6 +38,7 @@ type StateProps = {
   currentBio?: string;
   currentUsername?: string;
   progress?: ProfileEditProgress;
+  checkedUsername?: string;
   isUsernameAvailable?: boolean;
   maxBioLength: number;
 };
@@ -47,20 +49,20 @@ const ERROR_FIRST_NAME_MISSING = 'Please provide your first name';
 
 const SettingsEditProfile: FC<OwnProps & StateProps> = ({
   isActive,
-  onReset,
   currentAvatarHash,
   currentFirstName,
   currentLastName,
   currentBio,
   currentUsername,
   progress,
+  checkedUsername,
   isUsernameAvailable,
   maxBioLength,
+  onReset,
 }) => {
   const {
     loadCurrentUser,
     updateProfile,
-    checkUsername,
   } = getActions();
 
   const lang = useLang();
@@ -80,13 +82,16 @@ const SettingsEditProfile: FC<OwnProps & StateProps> = ({
   const isLoading = progress === ProfileEditProgress.InProgress;
   const isUsernameError = username === false;
 
+  const previousIsUsernameAvailable = usePrevious(isUsernameAvailable);
+  const renderingIsUsernameAvailable = isUsernameAvailable ?? previousIsUsernameAvailable;
+
   const isSaveButtonShown = useMemo(() => {
     if (isUsernameError) {
       return false;
     }
 
-    return Boolean(photo) || isProfileFieldsTouched || isUsernameAvailable === true;
-  }, [photo, isProfileFieldsTouched, isUsernameError, isUsernameAvailable]);
+    return Boolean(photo) || isProfileFieldsTouched || (isUsernameTouched && renderingIsUsernameAvailable === true);
+  }, [isUsernameError, photo, isProfileFieldsTouched, isUsernameTouched, renderingIsUsernameAvailable]);
 
   useHistoryBack({
     isActive,
@@ -144,8 +149,8 @@ const SettingsEditProfile: FC<OwnProps & StateProps> = ({
 
   const handleUsernameChange = useCallback((value: string | false) => {
     setUsername(value);
-    setIsUsernameTouched(true);
-  }, []);
+    setIsUsernameTouched(currentUsername !== value);
+  }, [currentUsername]);
 
   const handleProfileSave = useCallback(() => {
     const trimmedFirstName = firstName.trim();
@@ -216,10 +221,10 @@ const SettingsEditProfile: FC<OwnProps & StateProps> = ({
           <h4 className="settings-item-header" dir={lang.isRtl ? 'rtl' : undefined}>{lang('Username')}</h4>
 
           <UsernameInput
-            currentUsername={username || ''}
+            currentUsername={currentUsername}
             isLoading={isLoading}
             isUsernameAvailable={isUsernameAvailable}
-            checkUsername={checkUsername}
+            checkedUsername={checkedUsername}
             onChange={handleUsernameChange}
           />
 
@@ -239,7 +244,7 @@ const SettingsEditProfile: FC<OwnProps & StateProps> = ({
         isShown={isSaveButtonShown}
         onClick={handleProfileSave}
         disabled={isLoading}
-        ariaLabel="Save changes"
+        ariaLabel={lang('Save')}
       >
         {isLoading ? (
           <Spinner color="white" />
@@ -254,7 +259,7 @@ const SettingsEditProfile: FC<OwnProps & StateProps> = ({
 export default memo(withGlobal<OwnProps>(
   (global): StateProps => {
     const { currentUserId } = global;
-    const { progress, isUsernameAvailable } = global.profileEdit || {};
+    const { progress, isUsernameAvailable, checkedUsername } = global.profileEdit || {};
     const currentUser = currentUserId ? selectUser(global, currentUserId) : undefined;
 
     const maxBioLength = selectCurrentLimit(global, 'aboutLength');
@@ -262,6 +267,7 @@ export default memo(withGlobal<OwnProps>(
     if (!currentUser) {
       return {
         progress,
+        checkedUsername,
         isUsernameAvailable,
         maxBioLength,
       };
@@ -284,6 +290,7 @@ export default memo(withGlobal<OwnProps>(
       currentUsername,
       progress,
       isUsernameAvailable,
+      checkedUsername,
       maxBioLength,
     };
   },
diff --git a/src/components/right/management/ManageChatPrivacyType.tsx b/src/components/right/management/ManageChatPrivacyType.tsx
index 75940fd67..8cce80662 100644
--- a/src/components/right/management/ManageChatPrivacyType.tsx
+++ b/src/components/right/management/ManageChatPrivacyType.tsx
@@ -10,10 +10,12 @@ import { ManagementProgress } from '../../../types';
 
 import { selectChat, selectManagement } from '../../../global/selectors';
 import { isChatChannel } from '../../../global/helpers';
+import { selectCurrentLimit } from '../../../global/selectors/limits';
+
 import useFlag from '../../../hooks/useFlag';
 import useLang from '../../../hooks/useLang';
 import useHistoryBack from '../../../hooks/useHistoryBack';
-import { selectCurrentLimit } from '../../../global/selectors/limits';
+import usePrevious from '../../../hooks/usePrevious';
 
 import SafeLink from '../../common/SafeLink';
 import ListItem from '../../ui/ListItem';
@@ -37,22 +39,23 @@ type StateProps = {
   isChannel: boolean;
   progress?: ManagementProgress;
   isUsernameAvailable?: boolean;
+  checkedUsername?: string;
   isProtected?: boolean;
   maxPublicLinks: number;
 };
 
 const ManageChatPrivacyType: FC<OwnProps & StateProps> = ({
   chat,
-  onClose,
   isActive,
   isChannel,
   progress,
   isUsernameAvailable,
+  checkedUsername,
   isProtected,
   maxPublicLinks,
+  onClose,
 }) => {
   const {
-    checkPublicLink,
     updatePublicLink,
     updatePrivateLink,
     toggleIsProtected,
@@ -66,8 +69,11 @@ const ManageChatPrivacyType: FC<OwnProps & StateProps> = ({
   const [username, setUsername] = useState();
   const [isRevokeConfirmDialogOpen, openRevokeConfirmDialog, closeRevokeConfirmDialog] = useFlag();
 
+  const previousIsUsernameAvailable = usePrevious(isUsernameAvailable);
+  const renderingIsUsernameAvailable = isUsernameAvailable ?? previousIsUsernameAvailable;
+
   const canUpdate = Boolean(
-    (privacyType === 'public' && username && isUsernameAvailable)
+    (privacyType === 'public' && username && renderingIsUsernameAvailable)
     || (privacyType === 'private' && isPublic),
   );
 
@@ -175,7 +181,7 @@ const ManageChatPrivacyType: FC<OwnProps & StateProps> = ({
               currentUsername={chat.username}
               isLoading={isLoading}
               isUsernameAvailable={isUsernameAvailable}
-              checkUsername={checkPublicLink}
+              checkedUsername={checkedUsername}
               onChange={setUsername}
             />
             <p className="section-info" dir="auto">
@@ -219,13 +225,14 @@ const ManageChatPrivacyType: FC<OwnProps & StateProps> = ({
 export default memo(withGlobal<OwnProps>(
   (global, { chatId }): StateProps => {
     const chat = selectChat(global, chatId)!;
-    const { isUsernameAvailable } = selectManagement(global, chatId)!;
+    const { isUsernameAvailable, checkedUsername } = selectManagement(global, chatId)!;
 
     return {
       chat,
       isChannel: isChatChannel(chat),
       progress: global.management.progress,
       isUsernameAvailable,
+      checkedUsername,
       isProtected: chat?.isProtected,
       maxPublicLinks: selectCurrentLimit(global, 'channelsPublic'),
     };
diff --git a/src/global/actions/api/management.ts b/src/global/actions/api/management.ts
index 6364dbd25..fcbad483c 100644
--- a/src/global/actions/api/management.ts
+++ b/src/global/actions/api/management.ts
@@ -1,6 +1,7 @@
 import { addActionHandler, getGlobal, setGlobal } from '../../index';
 
 import { ManagementProgress } from '../../../types';
+
 import { callApi } from '../../../api/gramjs';
 import {
   addUsers, updateChat, updateManagement, updateManagementProgress,
@@ -22,17 +23,16 @@ addActionHandler('checkPublicLink', async (global, actions, payload) => {
 
   const { username } = payload!;
 
-  global = updateManagementProgress(global, ManagementProgress.InProgress);
-  global = updateManagement(global, chatId, { isUsernameAvailable: undefined });
+  global = updateManagement(global, chatId, { isUsernameAvailable: undefined, checkedUsername: undefined });
   setGlobal(global);
 
-  const isUsernameAvailable = await callApi('checkChatUsername', { username })!;
+  const isUsernameAvailable = (await callApi('checkChatUsername', { username }))!;
 
   global = getGlobal();
   global = updateManagementProgress(
     global, isUsernameAvailable ? ManagementProgress.Complete : ManagementProgress.Error,
   );
-  global = updateManagement(global, chatId, { isUsernameAvailable });
+  global = updateManagement(global, chatId, { isUsernameAvailable, checkedUsername: username });
   setGlobal(global);
 
   if (isUsernameAvailable === undefined) {
@@ -66,7 +66,7 @@ addActionHandler('updatePublicLink', async (global, actions, payload) => {
 
   global = getGlobal();
   global = updateManagementProgress(global, result ? ManagementProgress.Complete : ManagementProgress.Error);
-  global = updateManagement(global, chatId, { isUsernameAvailable: undefined });
+  global = updateManagement(global, chatId, { isUsernameAvailable: undefined, checkedUsername: undefined });
   setGlobal(global);
 });
 
diff --git a/src/global/actions/api/settings.ts b/src/global/actions/api/settings.ts
index a917deed6..850eb2261 100644
--- a/src/global/actions/api/settings.ts
+++ b/src/global/actions/api/settings.ts
@@ -92,6 +92,7 @@ addActionHandler('checkUsername', async (global, actions, payload) => {
     ...global,
     profileEdit: {
       progress: global.profileEdit ? global.profileEdit.progress : ProfileEditProgress.Idle,
+      checkedUsername: undefined,
       isUsernameAvailable: undefined,
     },
   });
@@ -103,6 +104,7 @@ addActionHandler('checkUsername', async (global, actions, payload) => {
     ...global,
     profileEdit: {
       ...global.profileEdit!,
+      checkedUsername: username,
       isUsernameAvailable,
     },
   });
diff --git a/src/global/types.ts b/src/global/types.ts
index 266713143..338f0d164 100644
--- a/src/global/types.ts
+++ b/src/global/types.ts
@@ -511,6 +511,7 @@ export type GlobalState = {
 
   profileEdit?: {
     progress: ProfileEditProgress;
+    checkedUsername?: string;
     isUsernameAvailable?: boolean;
   };
 
diff --git a/src/types/index.ts b/src/types/index.ts
index ac9e44105..69badfe06 100644
--- a/src/types/index.ts
+++ b/src/types/index.ts
@@ -313,6 +313,7 @@ export enum ManagementProgress {
 export interface ManagementState {
   isActive: boolean;
   nextScreen?: ManagementScreens;
+  checkedUsername?: string;
   isUsernameAvailable?: boolean;
   error?: string;
   invites?: ApiExportedInvite[];